On the night of December 15, 2003, the victim, Aston Dwayne Thompson, was shot and killed as he walked to his car parked behind an apartment building. Two guns were fired at the victim, and a third was fired into the street in front of the apartment building from the rear. Of the possible assailants, only one, the defendant, was apprehended; he was found near the scene of the shooting with a gunshot wound to the leg. A Superior Court jury convicted the defendant of murder in the first degree on theories of deliberate premeditation and extreme atrocity or cruelty.1
The defendant’s claims on appeal relate largely to statements he made to a detective while he was in custody in a hospital recovering from the gunshot wound. For strategic reasons, the detective chose not to record the first part of that interrogation, but he did record the second. After a hearing on the defendant’s motion to suppress the entire interrogation, a Superior Court judge ruled that the statements made in the initial, unrecorded portion were admissible, but ordered that the recorded statements be suppressed.2 The defendant contends that the motion judge erred in failing to suppress the unrecorded statement, and also that the trial judge erred in permitting the interrogating detective to testify to his memory of the unrecorded statement where the *722source of that testimony was a transcript of the suppressed recorded statement that the detective had reviewed prior to trial.
The defendant asserts errors also in the dismissal of an unsworn seated juror during empanelment; certain limitations imposed by the judge on the defendant’s cross-examination of a witness; and statements made by the prosecutor during closing argument that were not supported by the evidence. The defendant requests further that we exercise our authority pursuant to G. L. c. 278, § 33E, to reduce his conviction to a lesser degree of guilt or to order a new trial. Because a number of aspects of the trial, among them the detective’s testimony concerning the defendant’s unrecorded statements, prejudicial limitations on the defendant’s right to cross-examine the detective, and certain of the prosecutor’s remarks in closing argument, created a substantial likelihood of a miscarriage of justice, the defendant is entitled to a new trial.
Background. We summarize facts the jury could have found, reserving some details for later discussion. During the evening hours of December 15, 2003, the victim was at his friend Robert Hylton’s apartment in the Dorchester section of Boston. Also in the apartment were Hylton’s wife and son, and at least five other men who were socializing there.3 Around 9:45 p.m., the victim left to purchase beer. As he walked to his automobile, which was in the parking area behind the building, multiple shots were fired; he suffered gunshot wounds to the head, chest, abdomen, arm, and wrist.
Hearing the gunshots, another guest demanded a weapon, and Hylton handed him something in a small paper bag. A short time later, more shots were heard coming from the front of the building. A private security guard who was working in the area, Wilson Jean-Philippe, was seated in his parked automobile a few houses down the street from Hylton’s building when he heard the sound of gunshots. A man he later identified as the defendant ran up to his vehicle and, approaching on the driver’s side, asked for help. Jean-Philippe refused the request. The *723defendant, who was bleeding from his left leg, began banging on the driver’s side window, reiterating his pleas. When the defendant reached for something in his pants, Jean-Philippe drove away. Some time later, Jean-Philippe returned to where he had been parked. He found a gun on the ground with what appeared to be blood on it, and notified police officers at the scene.
When emergency personnel arrived at Hylton’s apartment building, the victim was bleeding heavily from his wounds. He was transported by ambulance to a hospital, where he died of his injuries. Police interviewed Hylton and five of the men who had been in the apartment4; they also searched the surrounding area. Several shell casings were recovered in front of Hylton’s apartment building. The gun found by Jean-Philippe, a .357 caliber semiautomatic with blood on the grips and barrel, was recovered near a neighboring building; the defendant was a possible source of deoxyribonucleic acid (DNA) found on the gun. A bullet recovered from the victim’s body could have been fired from that weapon, and at least one other bullet, recovered from a pool of blood beneath the victim, also could have been fired from it.
A trail of blood led from the area where Jean-Philippe found the gun to the access ramp of a nearby building. Police found the defendant underneath the ramp, lying in the snow and bleeding from an apparent gunshot wound to his leg; he was in visible pain but responsive. After he was placed in an ambulance, Detective Sergeant Daniel Keeler read him the Miranda warnings from a card.5 Shortly after midnight, Keeler arrived at the hospital with two other detectives; he again recited the Miranda warnings and obtained some biographical information from the defendant, but the defendant stated that he did not want to talk at that time, and the detectives left without further questioning.
On December 16, 2003, the day after the shooting, a warrant issued for the defendant’s arrest on the murder charge. Shortly before 5 p.m., Keeler returned to the hospital with Detective *724John Callahan. The defendant was lying in bed with an intravenous tube attached to one arm; he occasionally grimaced in pain, but was able to converse with the detectives. Keeler informed him that he was being charged with murder and recited the Miranda warnings from memory.6 Keeler then told the defendant that he was in a “heap of trouble” but there were “two sides to every story,” and he encouraged the defendant to talk to him. The defendant, who was upset and crying, asked to speak just with Keeler. Callahan left them alone in the room for ten to fifteen minutes; during that time, the defendant expressed concern for the safety of his family, then provided details of the shooting, including descriptions of two accomplices and his motive for participating. Afterward Callahan returned to the room, whereupon Keeler recounted what the defendant had told him as the defendant nodded in affirmation.7
Proceedings. To provide context for our later discussion, we summarize certain pertinent proceedings.
1. Grand jury. When Keeler appeared before the grand jury a few weeks after the murder, he testified that after he had served the murder warrant on the defendant at the hospital and advised the defendant of his Miranda rights, the defendant told him that he and another, unnamed individual had been solicited by a man to rob the victim; that they positioned themselves behind some trees in the back of an apartment building; and that the defendant and the unnamed individual approached the victim and shot him several times.8 Asked to describe the defendant’s “emotional state in terms of his wishes to talk to you,” Keeler *725responded, “Oh, [the defendant] expresses several times, T want to talk to you. I want to talk to you.’ He actually talked to me a bit in the beginning alone, all post-Miranda. I then summoned Detective Callahan into the room. We took a tape-recorded statement from [the defendant], which chronicled the robbery, the shooting, and what led up to it.” A copy of the tape recording was provided to the grand jury.
2. Hearing on the motion to suppress. A hearing on the defendant’s motion to suppress was held in December, 2005, two years after the shooting. Defense counsel had made a transcript of the defendant’s recorded statement and, in anticipation of his cross-examination of Keeler, provided copies to him and to the prosecutor. Keeler stated that he had reviewed the transcript for five to ten minutes immediately prior to the hearing.
Keeler testified that when he and Callahan went to the defendant’s hospital room around 5 p.m. on December 16, 2003, and told the defendant that he was going to be charged with murder, the defendant became upset and, after a brief conversation, asked to speak to Keeler alone. According to Keeler, the conversation that followed was not “that long.” Keeler testified that when Callahan left the room, “[the defendant] was crying, I’m in a lot of trouble, blah, blah, blah, blah. ... He gave me a brief little thing in the beginning of what happened. That it wasn’t supposed to go down that way.”9 Keeler said that he had neither taken notes nor written a report about the defendant’s initial statement, and explained that he had chosen not to tape record that part of the interrogation because doing so might have had a “chilling effect” on his interactions with the defendant.10
The motion judge denied the defendant’s motion to suppress the unrecorded statement, finding credible the testimony that Miranda warnings had been given and that the defendant’s *726initial statement was made voluntarily. He allowed the motion to suppress the recorded statement, however, because he concluded that the second portion of the interview took place after the defendant had invoked his right to counsel.11
3. Motions in limine. During the trial, on the day before Keeler was to testify, defense counsel made an oral motion to prevent Keeler from refreshing his recollection about the unrecorded statement with the transcript of the suppressed statement. Learning that Keeler had already reviewed the transcript, the judge concluded the issue was moot. The following day, defense counsel filed a written motion seeking to limit Keeler’s testimony to include only “evidence elicited before the [gjrand [jjury or at the [sjuppression [hjearing, excluding any evidence that may give the jury any indication that there was a suppressed taped interview”; the judge denied the motion “as drafted.” Counsel continued to press his claim, arguing that allowing Keeler to testify about his recollection of the unrecorded statement, and to include details Keeler had not previously recalled and testified to, would permit the prosecution to introduce statements that had been suppressed. The judge expressed concern that restricting Keeler’s testimony as requested would “not do justice” because “it’s also a question of [Keeler’s] memory today.” The judge then conducted a brief voir dire in order to assess whether Keeler had “a legitimate basis for his knowledge [of the unrecorded *727statements] other than in the tape.”12 Following the voir dire, the judge ruled that, with two minor exceptions on topics for which Keeler stated that he had no independent memory, Keeler could testify to all of the defendant’s unrecorded statement.13
Discussion. 1. Motion to suppress. The defendant contends that the motion judge should have allowed his motion to suppress all of the statements he gave to the police, unrecorded as well as recorded. He argues that the judge erred in finding that Keeler gave the defendant each of the required warnings under Miranda v. Arizona, 384 U.S. 436 (1966) (Miranda); that the defendant’s Miranda waiver was knowing and voluntary; and that his subsequent statements were given voluntarily. In reviewing the denial of a motion to suppress statements, we “independently apply constitutional principles to the facts, but defer to the motion judge’s findings of fact unless they are clearly erroneous.” Commonwealth v. Leahy, 445 Mass. 481, 485 (2005). We conclude as to each of the three claims that the motion judge correctly denied the defendant’s motion to suppress.
Although Keeler gave incomplete Miranda warnings when he was asked on cross-examination to recite them from memory, the motion judge found credible Keeler’s testimony that he gave the defendant accurate and complete Miranda warnings from memory after arriving at the hospital in the late afternoon of December 16 and notifying the defendant that he had been charged with murder. The motion judge based his finding on “Keeler’s considerable experience, his testimony on direct examination, the circumstances surrounding the initial recitation of the warnings . . . , and the defendant’s acknowledgment during the subsequent taped statement that he had received his rights.”14 The judge also credited the testimony of another *728detective, who was present during Keeler’s first visit to the hospital early in the morning on December 16, that he heard Keeler give complete Miranda warnings to the defendant, and that the defendant responded that he understood them. The judge did not err in concluding that the defendant received complete Miranda warnings.
The defendant claims also that the Commonwealth failed to establish beyond a reasonable doubt that he knowingly, intelligently, and voluntarily waived his Miranda rights. See Commonwealth v. Lopes, 455 Mass. 147, 167 (2009). The motion judge found that, “although in the hospital recovering from a gunshot wound, [the defendant] was oriented, responsive, and not exhibiting any level of confusion.” While noting that the defendant had not graduated from high school and lacked experience with the criminal justice system, see Commonwealth v. Anderson, 445 Mass. 195, 203 (2005), the judge stated also that “the evidence suggests that it was the defendant who indicated a desire to speak with . . . Keeler privately, apparently motivated by his concern for the safety of his family and his desire to keep his cooperation with the police secret.” See Commonwealth v. Groome, 435 Mass. 201, 217 (2001) (defendant knowingly and voluntarily waived his right to silence where he initiated conversation with police).
Furthermore, there was no evidence that the defendant had been administered medications of a type, and in amounts, that would have impaired his ability to think clearly, or that his condition was such that he could not comprehend what the detectives were saying. Cf. Commonwealth v. Johnson, 371 Mass. 862, 869-870 (1977). The defendant points out that Keeler arrived at the hospital in the late afternoon of December 16, 2003, hoping to obtain a confession from the defendant, and suggests that this supports an inference that the defendant’s incriminating statements were coerced. We do not agree that *729Keeler’s statement, standing alone, supports the inference the defendant asks us to make. See Commonwealth v. Mello, 420 Mass. 375, 384 (1995). The record amply supports the motion judge’s conclusion that the defendant’s waiver was knowing and voluntary.
Based in essence on the same arguments advanced by the defendant to support his claim that he did not waive his Miranda rights, the defendant contends that his statements also were not voluntarily made. “The voluntariness of the waiver on the basis of Miranda and the voluntariness of the statements on due process grounds are separate and distinct issues but they are both determined in light of the totality of the circumstances and they share many of the same relevant factors.” Commonwealth v. Edwards, 420 Mass. 666, 673 (1995). In determining whether the defendant’s statements were voluntary, we consider whether the statements “were the product of a ‘rational intellect’ and a ‘free will.’ ” Id., quoting Commonwealth v. Selby, 420 Mass. 656, 662 (1995). The defendant does not contend that Keeler employed falsehoods, deception, or trickery to elicit the statements, see Commonwealth v. Selby, supra at 664, or that the defendant was given assurances of leniency if he confessed. See Commonwealth v. DiGiambattista, 442 Mass. 423, 437 (2004) (DiGiambattista). Further, the motion judge found that it was the defendant who sought to speak to Keeler alone, and the defendant does not contend that he was unable to exercise his free will in doing so. See Commonwealth v. Edwards, supra. See also Commonwealth v. Martinez, 458 Mass. 684, 694 (2011). Therefore, it was not error for the motion judge to conclude that the defendant’s unrecorded statements were made voluntarily.
2. Right to remain silent. The defendant contends that, because he invoked his right to silence shortly after he was admitted to the hospital, police violated that right when they returned to question him on the same subject nearly seventeen hours later. Citing Michigan v. Mosley, 423 U.S. 96 (1975), the defendant argues that because he had invoked his right to silence, he had a right, before any new questioning, to “control the time at which questioning occurs, the subjects discussed, and the duration of the interrogation.” Id. at 103-104. In that case, following proper Miranda warnings, the defendant was questioned about an armed *730robbery, but officers ceased their questioning when the defendant told them that he had nothing more to say about the robbery. Id. at 104. Several hours later, after again administering Miranda warnings, a different officer questioned the defendant about an unrelated murder. Id. In denying the defendant’s motion to suppress the second statement, the United States Supreme Court determined that the defendant had invoked his right to silence during the initial interrogation, but concluded that, under the circumstances presented, the police had “scrupulously honored” his exercise of that right. Id. at 104, 105-106.
When Keeler and two other detectives arrived at the hospital shortly after midnight on December 16, the defendant was still in the emergency room; he had been there for no more than one hour. His purported invocation consisted of telling the detectives, “I don’t want to say anything right now,” and they left without questioning him further. Although we cannot say on this record that the remark was clearly and unequivocally an expression of the defendant’s constitutional right to remain silent, see Commonwealth v. Leahy, 445 Mass. 481, 488 (2005) (“Whether invocation of the right is clear and unequivocal is to be determined by the totality of the circumstances”), it was not error to admit the defendant’s subsequent statement where the officers immediately ceased their questioning, waited seventeen hours before returning to question the defendant, and again read the Miranda warnings before questioning him.
3. Police witness’s testimony. The defendant challenges the admission at trial of Keeler’s detailed testimony concerning the contents of his unrecorded statement. He argues that, in the circumstances, Keeler could not have had an independent memory of the defendant’s unrecorded statement, and that Keeler’s trial testimony, which came after he had reviewed the subsequent recorded statement at least twice, effectively allowed portions of the suppressed statement to be placed before the jury. We conclude that the admission of Keeler’s testimony without first establishing that it reflected Keeler’s present memory of the defendant’s unrecorded statement, in combination with other issues, see infra, gave rise to a substantial likelihood of a miscar*731riage of justice.15 See Commonwealth v. Randolph, 438 Mass. 290, 294 (2002).
In Commonwealth v. O’Brien, 419 Mass. 470, 478-479 (1995), we set forth fundamental requirements regarding refreshing a witness’s memory. A witness whose memory has been exhausted may have that memory refreshed in the presence of the jury by any means that permits the witness to testify from his or her own memory. Id. at 478. We have recognized also that a witness may at times review a document prior to testifying in order to refresh his or her memory and better prepare to testify. See id. at 479 & n.5; Commonwealth v. Marsh, 354 Mass. 713, 721-722 (1968). See also Mass. G. Evid. § 612(b) (2011). In certain circumstances, memory may be refreshed by evidence that is itself inadmissible. See, e.g., Commonwealth v. Levine, 280 Mass. 83, 90-91 (1932). However, we are aware of no appellate decision in the Commonwealth that addresses the particular concern the defendant raises here: the use of evidence that has been obtained in violation of the defendant’s invocation of his rights under Miranda, and ordered suppressed, to refresh a witness’s testimony before a criminal trial.
We do not decide today that it is impermissible for a witness to testify concerning an event after his memory has been refreshed by his review, before taking the stand, of material that is suppressed due to violations of a defendant’s rights under the Fifth Amendment to the United States Constitution and art. 12 of the Massachusetts Declaration of Rights. However, before such a witness is permitted to testify, the judge must ensure that the Commonwealth has met its burden of establishing that the witness will testify not from a memory of the suppressed statement, which by definition is not to be placed in evidence, but from an independent memory of the separate event. This requires that the judge conduct a voir dire through which the basis for the witness’s assertion that he or she has a present recollection of the separate event may be thoroughly examined.
In the ordinary circumstance, where a witness has been *732questioned on the stand and is unable to recall the subject of that questioning, the witness must state that his or her memory is exhausted before counsel may, in the presence of the jury, seek to refresh the witness’s memory by means of a document. In this way, the jury have been made aware of the limitations of the witness’s memory and the areas that could not initially be recalled, and they see that the witness has reviewed a document before asserting that he now has a memory. Opposing counsel may seek to impeach the witness by invoking the witness’s prior inconsistent statements on the subject, thus permitting the jury to conclude that the testimony derived wholly from the review of the document, or by introducing the document itself into evidence to show that it could not have aided the witness as claimed. See Mass. G. Evid., supra at § 612(a). See also United States v. Rappy, 157 F.2d 964, 967-968 (2d Cir. 1946), cert. denied, 329 U.S. 806 (1947).
However, when memory is refreshed prior to trial with a document that the jury cannot consider because it has been suppressed, the witness appears before the jury with developed testimony that does not reflect a prior inability to recall. Impeachment with prior statements of the witness is less effective, and the jury do not have the opportunity to consider whether the witness’s detailed trial testimony is based on a memory of the event or instead derived from the review of the document. Absent the opportunity for full and effective cross-examination directed to the possible sources of that testimony, it will appear to the jury that the testimony was based solely on the witness’s present memory of the event.
In this case, where the jury lacked knowledge of the suppressed tape recording that Keeler had used to refresh his memory, the prosecutor had a powerful advantage. One of the most potent ways to attack the credibility of a witness who has refreshed his memory, whether prior to or during his testimony, is to use the refreshing material itself to attack the existence, extent, or accuracy of that witness’s memory. See United States v. Rappy, supra at 968.16 See also United States v. Riccardi, 174 F.2d 883, 888 (3d Cir.), cert. denied, 337 U.S. 941 (1949) (at trial, witness’s *733“capacities for memory and perception may be attacked and tested; his determination to tell the truth investigated and revealed; protestations of lack of memory . . . merely undermine the probative worth of his testimony”). Here, however, the suppressed statement could not be presented for any purpose, resulting in a risk that the jury gave greater credibility to Keeler’s testimony than would be warranted otherwise. Counsel was unable to test Keeler’s testimony by reference to anything the defendant might have said during the recorded interrogation; he could not point out that the allegedly refreshing document was not in fact a record of the interrogation to which Keeler was testifying, and he could not even inform the jury that Keeler had refreshed his memory.
The prosecutor elicited from Keeler testimony about statements made by the defendant four years prior to trial — statements that were made during what Keeler himself had previously described as, in essence, a priming of the pump, by which he hoped to gain the defendant’s trust and elicit a confession that he could then record. The detective did not make notes of the initial interview, and, by his own choice, it was not recorded. Before the grand jury and at the suppression hearing, Keeler testified that the initial, unrecorded interview was brief17; and when he testified during those proceedings about the defendant’s statements, it was apparent that the detective was being asked to testify about the statements he had recorded.18
*734The trial judge was appropriately concerned that Keeler might not be able accurately to distinguish in his own mind the statements the defendant made in the first interview from those made in the second.19 See DiGiambattista, supra at 446 (“Even assuming the most conscientious and good faith efforts of an interrogating officer, and even aided by a contemporaneous written statement or summary report, the officer can at best reconstruct only a portion of what was said over the course of an interrogation conducted months and oftentimes years prior to the time the officer testifies”).20
The judge was aware of the complexity of the issues and gave careful consideration to their resolution. Nonetheless, her solution was not adequate.21 Given the passage of time and *735Keeler’s recent refreshing of his memory, it was incumbent on the judge to take the steps necessary to ascertain whether, to what extent, and by what means Keeler was able to distinguish between what was contained in the document he reviewed and what he actually remembered taking place. See 20th Century Wear, Inc. v. Sanmark-Stardust Inc., 747 F.2d 81, 93 n.17 (2d Cir. 1984), cert. denied, 470 U.S. 1052 (1985) (judge required to determine “that the witness actually has a present recollection and that otherwise inadmissible evidence does not slip in inadvertently for its truth”). Cf. Commonwealth v. Kater, 388 Mass. 519, 528-529 (1983) (testimony from hypnotized witness in murder case inadmissible because, among other considerations, there was no way to distinguish “actual memory” from “pseudomemories” in hypnotic sessions, but witness could testify to prehypnotic memories, which should be preserved by “careful record”); Frio v. Superior Court of Los Angeles County, 203 Cal. App. 3d 1480, 1495 (1988) (remanding, in civil case, for determination whether witness who had reviewed illegally obtained recording and notes of same prior to trial enjoyed present recollection of recorded events). To make this determination, the judge was required to examine the foundations of Keeler’s claim to a present and independent recollection. See United States v. Riccardi, supra at 889.
However, such an examination did not occur. Prior to conducting the voir dire, the judge engaged the prosecutor and defense counsel in a search of the transcript of the recorded, suppressed interview22 in an effort to glean from it which of the defendant’s *736recorded statements had also been made in the earlier, unrecorded interview.23 During the voir dire, the judge repeatedly asked Keeler what, if anything, the defendant had said in his unrecorded statement on a given topic. She did not attempt to elicit the source of Keeler’s recollection or probe how he could be certain that he was testifying from actual memory of statements that he had been unable to recall in any detail at the suppression hearing two years earlier, rather than from the suppressed interview.24
That Keeler was at the time of trial able to recite details of statements made by the defendant does not, without more, establish that his recitation was based on his actual memory of the defendant’s statements in the first interview. Cf. United States v. Rappy, 157 F.2d 964, 967-968 (2d Cir. 1946) (where *737witness declares that item or writing has evoked memory, it may be shown “either that it has not evoked what appears to the witness as a memory, or that, although it may so appear to him, the memory is a phantom and not a reliable record of its content”). Notwithstanding the judge’s efforts, we cannot conclude on the basis of this record that the source of Keeler’s testimony was his memory of what the defendant said in the first unrecorded interview, rather than his memory of the second recorded and transcribed interview that was suppressed. See Commonwealth v. Kater, supra.
The prejudice to the defendant arising from Keeler’s trial testimony about the defendant’s statement was exacerbated by the judge’s limitations on the defendant’s right to cross-examine Keeler. Prior to trial, the Commonwealth moved to limit any challenge to Keeler’s memory of the unrecorded statement, arguing that such a challenge would open the door to the admission of the suppressed statement. At a hearing on the motion, the judge expressed concern that allowing the defendant to suggest on cross-examination that Keeler had no record of his interview of the defendant would invite the jury to draw a false inference. Accordingly, although the judge did not allow the Commonwealth’s motion and advised defense counsel that Keeler could “be impeached in any way that is appropriate,” she warned counsel that she would not permit him to dwell on the issue of Keeler’s failure to take notes during the unrecorded interview; counsel was permitted to question Keeler about notetaking only once, or risk the Commonwealth being allowed to introduce the suppressed statement in rebuttal. Counsel assured the judge that “what I am trying to do at all costs is avoid opening the door into a taped confession of [the defendant] at this trial.” Accordingly, during his brief cross-examination, he elicited from Keeler only once that Keeler took no notes of the interview, and he made no attempt to challenge Keeler’s memory.
The judge’s orders concerning cross-examination substantially hindered the defendant’s ability to challenge Keeler’s testimony, testimony that provided an important, if not the key, piece of evidence against the defendant in the Commonwealth’s case. See DiGiambattista, supra at 447 (exceptionally potent quality of defendant’s statement or confession is magnified when evidence *738of that statement or confession is presented by interrogating officers). Although the Commonwealth presented other evidence Unking the defendant to the scene of the shooting, “[tjhere is no dispute that the evidence of a defendant’s alleged statement or confession is one of the most significant pieces of evidence in any criminal trial.” Id. at 446. Moreover, the statement attributed to the defendant supported the Commonwealth’s theory that the murder was premeditated and contradicted the theory of the defense that the defendant was himself an unfortunate victim at the scene of the crime. Contrast Commonwealth v. Coleman, 366 Mass. 705, 711 (1975) (improperly admitted evidence innocuous when evidence did not contradict defense theory).
“The limits of cross-examination ordinarily rest in sound judicial discretion. However, reasonable cross-examination for the purpose of showing falsity of other testimony of the witness as to the main issues of the trial, or bias and prejudice on his part, is a matter of right.” Commonwealth v. Carroll, 360 Mass. 580, 589 (1971). Here, the judge’s restriction of the defendant’s right to cross-examine amounted to an abuse of discretion. It is the Commonwealth that must bear the consequences of a police officer’s decision not to record an interrogation. See DiGiambattista, supra. By restricting the defendant’s right to challenge Keeler’s testimony, and by suggesting that broader cross-examination might open the door to introduction of the suppressed statement, the judge effectively relieved the Commonwealth of its burden and shifted it to the defendant.
4. Closing argument. In closing, the prosecutor asked the jury to draw an improper inference that Callahan had memorialized in a written report the entire unrecorded statement the defendant made to Keeler.25 See Commonwealth v. Murchison, 418 Mass. *73958, 59-60 (1994) (although “[c]ounsel may argue from the evidence and may argue fair inferences that might be drawn from the evidence,” arguments not so supported are improper). Although Callahan had, in fact, testified to having written a report, the prosecutor knew that the report contained not a memorialization of the defendant’s unrecorded statement, but only a reference to having made a recording of the suppressed statement.26
The prosecutor’s argument was not a fair inference from the evidence. Indeed, as just indicated, the prosecutor had to have known that the inference was not only inaccurate but highly, and unfairly, misleading. Contrast Commonwealth v. Caillot, 454 Mass. 245, 258-259 (2009), cert. denied, 130 S. Ct. 1527 (2010) (no substantial likelihood of miscarriage of justice where prosecutor did not know, and reasonably should not have known, that factual statement in closing argument was false). The prosecutor’s improper argument substantially amplified the errors concerning the inadequate inquiry into Keeler’s memory of the defendant’s unrecorded statement and the limitations on cross-examination of Keeler.
5. DiGiambattista instruction. Pursuant to our power of review under G. L. c. 278, § 33E, we consider an error not objected to by the defendant at trial and not raised in his appeal to this court. Before trial, the Commonwealth filed a motion requesting that no instruction be given pursuant to DiGiambattista, on the ground that such an instruction would falsely imply to the jury that no statement of the defendant was ever recorded. The judge did not give the instruction, stating that a defendant “cannot benefit from a DiGiambattista charge in a situation where a judge has decided that the statement that is [recorded] is suppressed,” and that giving an instruction would distort reality “when, in fact, he was [recorded].” The defendant acquiesced to this view and did not request an instruction.
The defendant’s statements were separate and distinct parts of a two-stage interrogation. It was “the strategic decision of *740the interrogating officer” not to record both, id. at 446, and the police cannot capitalize on their decision to record only a portion of the interrogation in this fashion. See id. at 444. As we stated in DiGiambattista, it is only from “a complete recording of the entire interrogation that produced such a statement or confession, [that a fact finder] can evaluate its precise contents and any alleged coercive influences.” Id. at 446. Thus, in circumstances such as those present here, where the interrogation was not recorded in its entirety and the recorded portion was suppressed, the jury should have been instructed that, because there was no recording of the particular statement about which the interrogating officer testified, “the State’s highest court has expressed a preference that such interrogations be recorded whenever practicable,” and that “they should weigh evidence of the defendant’s alleged statement with great caution and care.”27 Id. at 447-448. At a new trial, a DiGiambattista instruction should be given on defense counsel’s request.
Conclusion. Taken as a whole, we conclude that the above errors require that we reverse the defendant’s convictions in this case and remand for a new trial.28 Combined, the errors raise a substantial likelihood that, in the unusual circumstances of this case, justice was not done by the verdict. See, e.g., Commonwealth v. Dwyer, 448 Mass. 122, 138-139 (2006), and cases cited; Commonwealth v. Cole, 380 Mass. 30, 38-39 (1980). See also Commonwealth v. Triplett, 398 Mass. 561, 562 (1986) (finding that “a review of the record as a whole supports a *741conclusion that there is a substantial likelihood of a miscarriage of justice” requiring a new trial).
As described above, Keeler’s testimony regarding the contents of the defendant’s unrecorded statements was of unquestionable importance to the prosecution of this case. That Keeler was able to testify in such detail lent an aura of credibility to his testimony, see Commonwealth v. Durling, 407 Mass. 108, 121-122 (1990) (details and specificity inherently important to credibility and reliability), and the Commonwealth acknowledged that Keeler’s credibility was a central issue in the case. See Commonwealth v. Arana, 453 Mass. 214, 228 (2009) (prejudice where central issue in case was victims’ credibility and improperly admitted evidence bolstered credibility). Moreover, the prosecutor’s closing argument emphasized and relied heavily on the detailed nature of Keeler’s testimony. See Commonwealth v. Tyree, 455 Mass. 676, 702 (2010) (“The prosecutor repeatedly tied the defendant to the crimes by referring to tainted evidence, and referred to the tainted evidence in order to corroborate the testimony of the police officers . . . .”). Although there was other evidence strongly supporting the defendant’s guilt, “the improperly admitted evidence had the dual purpose of both tying the defendant to the crime and supporting [the witness]’s credibility, thus intensifying the harm to the defendant’s rights.” Id. at 704.
The judgments are reversed, the verdicts are set aside, and the case is remanded to the Superior Court for further proceedings consistent with this opinion.
So ordered.