OPINION OF THE COURT
In a trial by jury in the Court of Common Pleas of Philadelphia County, the appellant, Leslie C. Beasley, was found guilty of murder of the first degree and possession of an instrument of crime. In connection with the murder conviction, appellant was sentenced to death, and for the possession offense he was sentenced to lD/z to 23 months imprisonment. The instant direct appeal ensued.
*282I. BACKGROUND
The homicide for which appellant was tried in the present case occurred on April 13, 1980, in Philadelphia, when Keith Singleton was fatally wounded by a shotgun blast while riding a bicycle. Appellant fled from the scene of the crime, and, until July 16, 1980, remained at large. On the latter date, appellant again committed murder, the victim this time being a Philadelphia police officer. Appellant was brought to trial and convicted in the police killing case prior to commencement of trial for the Singleton homicide. See Commonwealth v. Beasley, 504 Pa. 485, 475 A.2d 730 (1984).
Immediately after shooting the police officer on July 16, 1980, appellant fled from the scene in a van which was pursued and eventually stopped by a police detective. Upon being stopped, appellant exited from the van and was chased by the detective a short distance before stumbling to the ground and being apprehended. While appellant lay upon the ground, the detective noticed that the van contained yet another person, and, in the course of positioning himself to order that other person out of the van, the detective saw appellant throw his shirt into the air and then heard a loud thud, after which the shirt fell back to the ground. At the time he threw his shirt into the air, appellant was recumbent upon the ground in close proximity to an eight foot high cinderblock wall. Police recovered from the roof above the cinderblock wall a sawed-off shotgun, in addition to a revolver that appellant had used to kill the policeman. While appellant was in custody in connection with the police shooting, it was scientifically determined that the shotgun had been used in the Singleton homicide three months earlier; hence, appellant was charged with an additional crime, the Singleton murder.
II. TRIAL
At trial in the Singleton case, the sawed-off shotgun was admitted into evidence, as was a description of appellant’s being apprehended on July 16, 1980, but no mention was *283made of the reason for appellant’s having been pursued by police on that date. During cross-examination of the detective who found the shotgun, defense counsel intentionally elicited, for the first time in the trial, the fact that an additional weapon, the revolver, was found on the roof with the shotgun. No mention was made, however, of the fact that the revolver had been used to commit a crime. Cross-examination proceeded in a manner directed at showing the improbability of appellant having been able to throw two weapons onto the roof, from a reclining position on the ground several feet from the cinderblock wall. In pursuing this line of questioning, defense counsel’s strategy was to show that appellant threw his shirt onto the roof in an effort to disassociate himself from a quantity of marijuana which was later discovered by detectives to have been in the shirt pocket, and, thus, to show that the shirt hit the roof, by mere coincidence, near two weapons that had been placed there at a previous time by some other person.
To rebut the defense’s theory as to the manner in which the weapons came to be upon the roof, the prosecution introduced testimony that the revolver recovered from the roof was the same one that appellant had been observed to possess only minutes prior to his apprehension. Also, several shotgun shells found in the van from which appellant fled on July 16, 1980 were admitted into evidence, and these were positively identified as having been discharged from the shotgun in question.1 The effect of this rebuttal evidence was to imply that the weapons recovered from the roof had been thrown there by appellant.
At no time during the guilt determination phase of trial was evidence introduced that appellant committed a shooting on July 16, 1980. Appellant contends, however, that the jury would necessarily have surmised such criminal *284involvement, based upon the fact that appellant was pursued and apprehended on that date, and the fact that appellant was shown to have been in possession of a revolver. It is well settled that unrelated criminal conduct of an accused is generally inadmissible to prove his commission of the crime for which he is being tried. Commonwealth v. Styles, 494 Pa. 524, 527, 431 A.2d 978, 980 (1981). Nothing in the record, however, indicates that appellant was pursued on July 16, 1980 as a result of having committed a crime on that date, and the revolver proven to have been in appellant’s possession was not shown to have been used in the commission of any crime.
Even assuming, arguendo, that testimony as to appellant’s arrest on July 16, 1980 raised some suggestion of criminal activity unrelated to the Singleton homicide, there is no merit to the contention that the shotgun, and all testimony relating to July 16, 1980, should have been suppressed. The evidentiary value of showing that appellant was, three months after the Singleton shooting, in possession of the murder weapon greatly outweighed any possible prejudice to the defense. See Commonwealth v. Travaglia, 502 Pa. 474, 492-493, 467 A.2d 288, 297 (1983) (exceptions to general rule of inadmissibility of evidence of other crimes). Evidence of the shotgun, and of the events of July 16, 1980 linking appellant to that weapon, served to identify appellant as the perpetrator of the murder for which he was being tried, and supported the testimony of two eyewitnesses who indicated that appellant committed the Singleton murder.2
Further, appellant should not be heard to complain of the jury’s being informed of the revolver, for it was the defense which first elicited, during cross-examination of a detective, the fact that the revolver existed, as well as the fact that the revolver was found near the shotgun. See Commonwealth v. Sisco, 484 Pa. 85, 88, 398 A.2d 955, 957 (1979) (no error where defense introduces the allegedly objectionable *285evidence first); Commonwealth v. Cain, 471 Pa. 140, 156 n. 11, 369 A.2d 1234, 1242 n. 11 (1977) (Opinion in Support of Affirmance); Commonwealth v. Alston, 461 Pa. 664, 667, 337 A.2d 597, 598 (1975); Commonwealth v. Bell, 417 Pa. 291, 294, 208 A.2d 465, 467 (1965). Once the defense had elicited testimony regarding the revolver to advance its theory of the case, that someone other than appellant placed weapons on the roof, the prosecution was not required to refrain from rebutting that theory, and, hence, was entitled to show that the weapons recovered from the roof were ones that appellant had possessed shortly before his arrest. See Commonwealth v. Brown, 489 Pa. 285, 302 n. 6, 414 A.2d 70, 78 n. 6 (1980); Commonwealth v. Clark, 454 Pa. 329, 336-337, 311 A.2d 910, 913-914 (1973). Thus, by introducing testimony as to the existence of a revolver upon the roof, the defense opened the door for the prosecution to rebut the inference thereby created.
Appellant’s next claim of error is that the shotgun used in the Singleton homicide was transported into the courtroom in a box which the property custodian had labeled, in what was claimed by defense counsel to have been one-inch high letters, “Police shooting, homicide of police officer.” The box was placed on a table allegedly six feet from the nearest juror, but as soon as the label was discreetly brought by defense counsel to the attention of the prosecutor it was immediately covered.
During a recess, defense counsel moved for a mistrial,3 whereupon the trial court examined the box and determined that its label was not readable, at least from the bench. We *286have reviewed the record and find no adequate basis upon which to determine the exact position of the box in the courtroom, or the length of time that the box was present, or upon which to conclude that the box’s label could have been read by any of the jurors.
Nevertheless, the prosecutor’s blatant and inexcusable inattention in bringing the labeled box into the courtroom is to be most strongly condemned. Such conduct needlessly injected this case with an issue that, under less speculative circumstances, could be deemed to have impaired the integrity of the trial. In the present case, however, any prejudice to the defense is of such a speculative nature as not to require that a new trial be granted.
III. DEATH SENTENCE
At the penalty stage of this proceeding the prosecutor introduced evidence that appellant had, prior to the instant trial, been convicted of murder on two separate occasions. Subsequently, the jury found, upon an ample evidentiary basis, that there was present the aggravating circumstance that appellant “has a significant history of felony convictions involving the use or threat of violence to the person,”4 42 Pa.C.S.A. § 9711(d)(9), and that no mitigating circum*287stances were present, 42 Pa.C.S.A. § 9711(e). When an aggravating circumstance is present, and no mitigating circumstances are found, the jury is required to return a verdict of death. 42 Pa.C.S.A. § 9711(c)(l)(iv). Accordingly, appellant was sentenced to death.
It is alleged that the jury was improperly permitted to consider as a prior murder conviction a verdict of guilt of murder of the first degree rendered three months prior to the instant trial, a verdict as to which a judgment of sentence had not yet been entered because post-trial motions were still pending. Post-trial motions had been continued at the request of the defense, but were denied subsequent to the instant trial. In short, it is argued that a verdict of guilt may not be considered a prior “conviction,” constituting an aggravating circumstance under 42 Pa.C. S.A. § 9711(d)(9) supra., until a judgment of sentence has been entered. This Court recently rejected this argument in connection with determining what constitutes a conviction for purposes of one of the other enumerated aggravating circumstances set forth in the same sub-section of the sentencing code, 42 Pa.C.S.A. § 9711(d)(10), which states that it is an aggravating circumstance when “[t]he defendant has been convicted of another Federal or State offense, committed either before or at the time of the offense at issue, for which a sentence of life imprisonment or death was imposable____” (emphasis added). Commonwealth v. Travaglia, 502 Pa. 474, 495-301, 467 A.2d 288, 298-300 (1983). In Travaglia, we held that a judgment of sentence need not already have been entered following a finding of guilt in order for the finding to be considered as a conviction constituting the aggravating circumstance in (d)(10), thus ruling that the legislature employed the term “convicted” in this provision to mean “found guilty” rather than “found guilty and sentenced.”
There is no reason to believe that the meaning accorded by legislative references to convictions was not consistent in consecutively enumerated provisions listing aggravating circumstances within the same sub-section of the sentencing code. Thus, within 42 Pa.C.S.A. § 9711(d), conviction for *288purposes of (d)(9) should be construed as having the same meaning as does conviction for purposes of (d)(10), thus allowing verdicts of guilt for which judgments of sentence have not yet been imposed to be considered by the jury as part of a defendant’s history of felony convictions involving the use or threat of violence to the person. Under this approach, no error accrues unless the subsequently entered judgments of sentence are overturned on appeal. This comports with the traditional function of the penalty stage to focus upon aspects of a defendant’s character. See Commonwealth v. Bell, 417 Pa. 291, 296, 208 A.2d 465, 468 (1965). Character is reflected in verdicts of guilt, regardless of whether judgments of sentence have yet been entered.
Appellant’s next contention is that error was committed when evidence was admitted that the verdict of murder of the first degree rendered three months prior to the present trial resulted from appellant’s having killed a police officer, and further prejudice is claimed to have arisen from the jury’s being informed that the jury in the police killing case returned a verdict of death. The relevant sentencing provision, 42 Pa.C.S.A. § 9711(d)(9) supra., contains no express reference to the factual settings of past crimes or to the sentences imposed as being matters appropriate for the jury’s consideration. Thus, it is asserted that the prosecution’s evidence should have been limited to establishing the mere fact that appellant was convicted of previous murders, without elaboration as to the facts and circumstances, or as to the types of sentences imposed. Inasmuch as 42 Pa.C. S.A. § 9711(d) begins with the preface, “Aggravating circumstances shall be limited to the following ... ”, it is clear that the legislature did not intend consideration by the jury of matters extraneous to the enumerated aggravating circumstances. The relevant provision, (d)(9), focuses upon past “convictions” as being an aggravating circumstance. We do not believe the legislative reference to “convictions” is so narrow in scope as. to render extraneous all of the facts and circumstances of the convictions, or the sentences imposed.
*289In this Commonwealth, sentencing has long been regarded as having at its core a function of character analysis, See Commonwealth v. Bell, supra., and the central idea of the present sentencing statute is to allow a jury to take into account such relevant information, bearing upon a defendant’s character and record, as is applicable to the task of considering the enumerated aggravating circumstances. Consideration of prior “convictions” was not intended to be a meaningless and abstract ritual, but rather a process through which a jury would gain considerable insight into a defendant’s character. The nature of an offense, as ascertained through examination of the circumstances concomitant to its commission, has much bearing upon the character of a defendant, and, indeed, without reference to those facts and circumstances, consideration of “convictions” would be a hollow process, yielding far less information about a defendant’s character than is relevant.
Convictions are defined by the essential and necessary facts upon which they are based, and judgments of sentence flow naturally from, and form an integral part of, those convictions. Thus, reason impels that the construction of the term “convictions” in 42 Pa.C.S.A. § 9711(d)(9) be such as to permit consideration of the essential and necessary facts pertaining to the convictions, including the circumstances of the crimes and the sentences imposed. In the present case, therefore, no error was committed when the jury was informed that one of appellant’s prior murder convictions involved the killing of a police officer, and that the jury in that case had returned a verdict of death.5
Finally, in accordance with our duty to review sentences of death from the standpoint of their proportionality to sentences imposed in similar cases, Commonwealth v. Zettlemoyer, 500 Pa. 16, 62, 454 A.2d 937, 961 (1982), cert. den., 461 U.S. 970, 103 S.Ct. 2444, 77 L.Ed.2d 1327 (1983), *290we have reviewed the sentence imposed upon appellant in light of findings of the Pennsylvania Death Penalty Study. See Commonwealth v. Frey, 504 Pa. 428, 475 A.2d 700 (1984), and perceive no excess or disproportionality in the sentence imposed.
Judgments of sentence affirmed.
LARSEN, J., filed a dissenting opinion.
NIX, C.J., did not participate in the consideration or decision of this case.