On Saturday, August 13, 1988, Americo Scarelli (the victim) was found dead in his office at the Department of Public Works, 1023 Riverside Drive in Methuen. One month later, an Essex County grand jury returned an indictment charging the defendant with murder. A motion to suppress the defendant’s inculpatory statements to the police was denied after an evidentiary hearing, and on April 14, 1989, after a five-day trial, a jury returned a verdict of guilty of murder in the second degree. The defendant appealed, claiming errors in the suppression ruling and in the conduct of the trial. We affirm the judgment.
1. Motion to suppress. The defendant was arrested on August 18, 1988, in New Jersey as a result of an automobile accident in which he was involved. While the defendant was being held by the Newark police, Detective Conte read aloud the full Miranda warnings from the police department Miranda warning form, and then the defendant read aloud the portion which stated, “Anything you say can be used against you in a court of law.” The waiver paragraph at the bottom of the form was next read to the defendant, and he was asked to read the waiver to himself. The defendant signed the waiver, agreed to answer questions, and proceeded to give a detailed statement of the circumstances of the victim’s death.
The defendant admitted to a homosexual encounter with the victim, in the course of which the defendant stabbed the victim with the defendant’s knife and stuck him with a sharp object he found on a nearby sink. On appeal (but not at the suppression hearing) the defendant argues that the statement should be suppressed because at one point in the interrogation the following exchange occurred:
“Q. Shannon, you stated earlier that this man had grabbed your leg, is that all that happened?
“A. Ño.
“Q. Did any sexual act occur between you and him in that [building] ?
*287“A. Yes, but I don’t want to discuss it.’’
The questioning then was directed to another subject, and it continued to completion without objection or interruption. At the conclusion of the statement the defendant was asked, “Why have you given this statement?” The defendant answered, “Because I couldn’t live without paying for what I did and eventually I would have got caught.”
The defendant argues that because of his refusal to answer the single question just quoted, the interrogation should have ceased. There is no merit to the argument; the defendant’s rights were not violated. He had decided, for whatever reason, not to answer a particular question, but he did not indicate in any manner that he was invoking the right he had previously waived — his right to remain silent. The outcome, adverse to the defendant, is controlled by Commonwealth v. Roberts, 407 Mass. 731, 734 (1990), where the court said, “For the rule of Miranda regarding the termination of questioning to apply, there must be either an expressed unwillingness to continue or an affirmative request for an attorney,” quoting (with emphasis added) from Commonwealth v. Pennellatore, 392 Mass. 382, 387 (1984). Neither one occurred here. Contrast Commonwealth v. Taylor, 374 Mass. 426, 428-430 (1978).
2. Motion for a required finding of not guilty of murder. At the close of the Commonwealth’s case, which included the statement the defendant gave to the New Jersey police, the defendant moved for a required finding of not guilty of so much of the indictment as charged murder. The defendant’s argument is that the motion should have been allowed because the evidence showed that “the killing, while intentional, was without malice . . . .” The issue, then, is whether at the close of the Commonwealth’s case there was sufficient evidence, viewed in the light most favorable to the Commonwealth, for the jury to conclude, beyond any reasonable doubt, that the defendant acted with malice. See Commonwealth v. Latimore, 378 Mass. 671, 676-678 (1979).
The thrust of the motion is that the defendant’s statement to the police in New Jersey establishes no more than that the *288defendant acted in self-defense. However, the jury were “entitled to disbelieve the evidence that the defendant acted in self-defense.” Commonwealth v. Lamrini, 392 Mass. 427, 431 (1984), quoting from Commonwealth v. Fluker, 377 Mass. 123, 128 (1979). Disbelieving that portion of the statement, the jury could easily conclude on the basis of the remainder of the statement and other evidence that the defendant, beyond a reasonable doubt, acted with malice.
Joanne Richmond, a physician, forensic pathologist, and medical examiner for the Commonwealth of Massachusetts, had performed an autopsy on the body of the victim; she testified at the trial that the cause of death was a massive hemorrhage due to stab wounds and puncture wounds, primarily a stab wound in the neck. Dr. Richmond described bruises on the victim’s left cheek, around the left eye, and on the left side of the neck. On the right cheek there were two puncture wounds, one of which went to a depth of two inches. On the right side of the neck there was a stab wound that penetrated one and a half to two and a half inches. On the right upper chest there were two sets, or pairs, of puncture wounds. On the left chest there was a stab wound that had passed through the sternum bone “with a great deal of force” and “raised the sac around the heart” without entering the heart. This wound was two to three inches deep. The puncture wounds were caused by a two-pronged instrument; a carving fork was found near the victim. The stab wound was caused by a knife. The victim probably survived for twenty or thirty minutes after receiving the stab and puncture wounds; “there was almost no blood left in the body,” Dr. Richmond testified. The victim, according to Dr. Richmond, was sixty-five years old, height 5’7”, weight 170 pounds.
The circumstances described in the defendant’s own statement to the police certainly did not require any measure of self-defense. See Commonwealth v. Kendrick, 351 Mass. 203, 211-212 (1966). The defendant, who had never previously met the victim, was picked up by him on a public street and voluntarily went with him to the victim’s office, where the victim indicated he was interested in a homosexual en*289counter. When rebuffed, the victim swore at the defendant. At that point the defendant simply could have walked away; there is nothing in his statement that suggests there was any obstacle to his doing so. When the victim, in spite of the rebuff, took off his pants and shirt, the defendant admitted that he responded by taking out his knife and thrusting it forward and deeply into the victim’s neck. This was followed by blows about the head, a stab wound that almost entered the heart, and several puncture wounds caused by a carving fork. Then, having taken the keys to the victim’s car from his pants pocket, the defendant fled the Commonwealth in the victim’s car.
Moreover, “[t]here is no constitutional principle which bars the conviction of a defendant when there is evidence warranting an inference of malice and also evidence warranting, but not requiring, a finding that the defendant acted in self-defense.” Commonwealth v. Lamrini, 392 Mass. at 431.
The defendant relies on Commonwealth v. Johnson, 3 Mass. App. Ct. 226 (1975). That was a case, however, in which the victim initiated sudden combat and which involved “highly unusual circumstances,” id. at 231; it has no bearing on the substantially different facts of this case. Compare id. at 233.
There was no error in the denial of the motion.
3. Instructions on reasonable doubt. The defendant objected to the charge on reasonable doubt. His argument is that the judge (who eschewed, inexplicably, the “time-tested language of Commonwealth v. Webster, 5 Cush. 295, 320 [1850],” see Commonwealth v. Wood, 380 Mass. 545, 551 [1980]) erroneously instructed the jurors “that they may convict upon a moral certainty without more.”
There was no error in the judge’s charge on reasonable doubt.1 He gave the instruction, “Proof beyond a reasonable *290doubt is proof to a moral certitude,” but that, the Supreme Judicial Court has said, “is the heart of the matter,” Commonwealth v. Therrien, 371 Mass. 203, 207 (1976), for it conveys the high degree of probability that is required for conviction. Webster, too, uses the same phrase: “the evidence must establish the truth of the fact to a reasonable and moral certainty . . .” (emphasis supplied). Commonwealth v. Webster, 5 Cush. at 320. The reference in Webster to “reasonable . . . certainty” is meant to convey the idea, for the benefit of the Commonwealth, not the defendant, that “absolute certainty” of guilt is not required, ibid., and the absence of that idea was, if anything, a benefit to the defendant. Moreover, the judge told the jury that “if, when all is said and done there remain [s] in the mind of this jury a reasonable doubt from the evidence, then the law is clear, Shannon Ewing shall have the benefit of this doubt.” Contrast a charge which instructs the jury to convict in the absence of a “doubt which amounts to a moral certainty” (emphasis added). See Commonwealth v. Wood, 380 Mass. at 548.
4. The instruction on malice and intoxication. The defendant objected to the refusal of the judge to give the following instruction: “I have told you that one of the elements of the offense of murder which the Commonwealth must prove beyond a reasonable doubt is that the defendant acted with malice; that he specifically intended to kill. The defendant cannot be guilty of murder without that malice and specific *291intent. When you consider whether or not the Commonwealth has proved that the defendant acted with malice and had the necessary intent, you may take into account the evidence of intoxication.”
The judge was correct in refusing the requested instruction; there was no evidence of intoxication.2 The defendant testified that he had been drinking beer with the victim, but the record is barren of any evidence that the defendant was intoxicated or that the beer had any effect on his state of mind. See Commonwealth v. Moore, 408 Mass. 117, 134-135 (1990); Commonwealth v. Freiberg, 405 Mass. 282, 287 (1989).
5. The instructions on manslaughter. The defendant requested detailed instructions on the meaning of “heat of passion” and “provocation.”3 See Commonwealth v. Walden, 380 Mass. 724, 727 (1980). The judge’s instructions on these terms, which we set out in the margin,4 were adequate.
*292The defendant’s trial testimony — unlike his statement to the New Jersey police5 — described the victim’s act of fellatio upon the defendant. When the defendant resisted further advances, the victim positioned himself “near the door,” the defendant thereupon punched the victim, and a fistfight ensued, during the course of which the defendant drew out a knife from his back pocket and thrust it into the defendant’s neck and chest.
On the defendant’s own statements to the New Jersey police and on his testimony at the trial, an instruction on manslaughter was certainly favorable to the defendant, see Commonwealth v. Corriveau, 396 Mass. 319, 340-341 (1985), and the judge’s description of voluntary manslaughter was not defective or inadequate. Compare Commonwealth v. Weaver, 395 Mass. 307, 312 (1985). The judge did not have to give illustrations of acts that might constitute provocation, nor was he required to adopt the defendant’s requested charges, however nicely phrased. Ibid. There was no error.
The defendant’s argument that the judge’s instructions on the voluntariness of the defendant’s statement to the police in New Jersey were insufficient has no merit; the instructions were more expansive and detailed than the defendant’s re*293quests numbered thirty-six and thirty-nine which were the basis of the objection. See Mass.R.Crim.P. 24(b), 378 Mass. 895 (1979). In any event, the judge’s instructions were adequate. See Commonwealth v. Williams, 388 Mass. 846, 856-857 (1983).
The defendant’s remaining arguments are presented here for the first time, with the claim that certain alleged errors, to which the defendant did not object, created a substantial risk of a miscarriage of justice. After a careful review of the record, we conclude that there was no error. Further discussion is not warranted.
Judgment affirmed.