On an indictment charging murder in the first degree Paul R. Campbell, Jr. was convicted by a jury of the murder in the second degree of his roommate, James Duffey. Campbell was also convicted of possession of a dangerous weapon (knife) and assault by means of a dangerous weapon (knife) on William Biciocchi, another roommate. In this appeal pursuant to G. L. c. 278, §§ 33A-33G, Campbell challenges only his conviction of murder in the *309 second degree 1 and argues assignments of error concerning (1) the denial of his motion for a directed verdict of not guilty of murder in the second degree; (2) the admission of a photograph of the deceased after surgery; and (3) the failure of the judge to strike a word from the testimony of the government’s expert witness. We concluded that the conviction should be affirmed.
We summarize first the evidence presented by the Commonwealth. Campbell, Duffey (the victim of the homicide) , William Biciocchi (the victim of the assault by means of a dangerous weapon), and one Brenda Loveless had been part of the “same crowd” for approximately six years. In 1973, Campbell, Duffey, and Biciocchi shared an apartment in Cambridge. Brenda Loveless and the defendant started dating in February of 1969. They broke off and then resumed their relationship a number of times; at one time they had been engaged to be married.
In 1971, during one of the periods in which Brenda and the defendant were not seeing each other, Brenda started dating Duffey. About six weeks prior to the homicide, she spent one night with Duffey at the apartment. After the defendant learned of this, he told a friend that he was very upset that Brenda and Duffey were seeing each other and stated that he would not do such a thing to a friend.
Shortly before the homicide the defendant and Brenda again resumed their relationship. On the night of the killing, they went to a lounge where they had a few drinks. 2 Later, when the defendant was driving Brenda home 3 and away from his apartment, Brenda asked to leave the car and walk. She got out of the car and started to walk. The defendant turned the car around and stopped near Brenda who was, at that time, opposite the apartment.
*310 Brenda and Campbell began arguing loudly and heatedly about Brenda’s feelings for the defendant and their relationship. A portion of the argument concerned Brenda’s having stayed with Duffey. The defendant then forced Brenda to go into the living room of the apartment, where Duffey was asleep on the couch. Brenda and Campbell continued their quarrel, thereby partially awakening Duffey.
Before Duffey awakened, the defendant went to his own room and took a switchblade knife from a dresser drawer. On his return, Campbell found Duffey awake. Duffey moved to leave the room, but the defendant pushed him back. The defendant then repeatedly ordered Brenda and Duffey to have sexual intercourse in front of him. Brenda was hysterical and screaming. Duffey repeatedly asked, “What’s going on?” The defendant continued to yell.
At this point, Biciocchi entered the room. The defendant pointed the knife at him and said, “Get back. This is none of your business. Get out of here.” Biciocchi told the defendant to put the knife down, and, when Campbell did not comply, Biciocchi left to call the police.
The defendant continued screaming at Brenda and Duffey and pointing the knife at them. Brenda, the only witness other than the defendant in the room when the stabbing which followed occurred, testified that she saw Duffey “bounce onto the couch, grab his chest, and slide to the floor.” Brenda did not actually see the defendant stab Duffey.
Immediately thereafter the defendant went into the outside hall to get help from a nurse who lived in the apartment above. He also tried to summon help from a hospital and the police.
When the police arrived, the defendant told them that he had stabbed Duffey, but that it was an accident since Duffey had walked into the knife. He stated that he had had an argument with Duffey over a girl.
The next morning the defendant was interviewed by the Cambridge police. He repeated that he had argued with Duffey about Brenda. He stated that he had kicked Duffey *311 onto the couch while holding the open knife in his hand. He said that Duffey had bounced back up from the couch and “walked into the knife.”
Duffey died a week later as a result of the knife wound. A pathologist testified that a “forceful” thrust, not a glancing thrust, would have been required to cause the wound which killed Duffey.
The defendant testified in his own behalf. The defendant’s account of his relationship with Brenda, of his feelings about Brenda’s staying with Duffey, and of the general events of the night of the killing was basically similar to the evidence presented by the Commonwealth. However, he stated that he never intended to hurt anyone with the knife; rather he only planned to use it to scare Brenda and Duffey. He also stated that after he kicked Duffey onto the couch, Duffey bounced toward him and was wounded.
1. Motions for a Directed Verdict.
At the close of the Commonwealth’s case and again after the defense rested, the defendant moved for a directed verdict of not guilty on so much of the indictment as charged murder in the first and second degree. The motions were denied. In considering whether these denials were correct we review only the evidence introduced up to the time that the Commonwealth rested its case.
Commonwealth
v.
Kelley,
The denial of the motions for a directed verdict raises the issue whether there was sufficient evidence to warrant submission of the charge of murder in the second degree to the jury.
5
See
Commonwealth
v.
Kelley, supra
at 150.
Com
*312
monwealth
v.
Caine,
A defendant’s intent may properly be proved by reasonable and possible inferences from the evidence.
Commonwealth
v.
Beckett,
The existence of malice may also be inferred from the intentional use of a deadly weapon.
Commonwealth
v.
Greene,
The defendant argues, however, that because his statements to the police, and later his own testimony, demon
*313
strate that he did not intend to kill Duffey, the circumstantial evidence of malice was insufficient and the inference of malice from the use of a deadly weapon was rebutted. We disagree. A jury is not required to believe any or all of a defendant’s statements; rather, it may believe only such portions of the statements as it may consider trustworthy.
Commonwealth
v.
Amazeen, supra
at 80 n.5.
Commonwealth
v.
McInerney,
The judge was correct in determining that he could not rule as matter of law that the defendant lacked malice.
2. Photograph of Deceased.
During the course of the trial a photograph of the deceased was admitted showing one incision held together with black stitches extending down the chest beneath the nipple and a second penetration below the incision. The defendant argues that the admission of this picture constituted prejudicial error because the picture was inflammatory and because it was unnecessary to prove the Commonwealth’s case since there had already been verbal testimony concerning the nature of the wound.
The admission of such photographs is within the discretion of the trial judge. See Commonwealth v. Amazeen, supra at 84. There was no abuse of discretion.
The fact that there had been previous testimony concerning the nature of the wound does not render the photograph lacking in probative value.
Commonwealth
v.
Bys,
The fact that the picture showed a surgical incision above the wound could not have misled the jury as to the injuries sustained since it was made quite clear that this incision was made in the course of medical treatment. See
Commonwealth
v.
Ellis,
3. Expert Testimony.
During the direct examination of the forensic pathologist the following exchange took place:
Assistant district attorney: “Now, I’m asking you, Doctor, if you can tell us what degree of force is required to have penetrated that portion of the rib cage to the interior of the chest into the heart?”
The witness: “Well, this would take an appreciable degree of force. This wouldn’t be a simple glancing thrust. It had to be a forceful, purposeful thrust to penetrate through the rib cage.”
Counsel for the defendant: “If the Court please.”
The witness: “Through the rib cage.”
Counsel for the defendant: “The use of the word ‘purposeful.’”
The judge: “ ‘Purposeful.’ ”
Counsel for the defendant: “May it be stricken?”
The judge: “Would that be a medical term? Or another
The witness: “Well, I tried to indicate in some language that this — that this is not just a holding of a knife, let’s say, by two fingers; but you have to hold the knife, and — or a *315 weapon of this kind — and it has to make a forceful thrust to penetrate through the chest cavity.”
The judge: “All right. Having defined the meaning of the word, the answer will stand.”
Counsel for the defendant: “Note my objection and exception please.”
The judge: “Yes.”
The defendant argues that it was prejudicial error to refuse to strike the reference to “purposeful” because such a conclusion was beyond the scope of the expert’s competence. See
Commonwealth
v.
Montmeny,
If there was any error in the refusal to strike the word “purposeful,” it was not prejudicial. By having the witness clarify the meaning of the term “purposeful,” the judge, in substance, granted the defendant the same relief which could have been obtained by the allowance of the motion to strike. See
Commonwealth
v.
Lannon,
4. G. L. c. 278, § 33E.
Pursuant to our authority under G. L. c. 278, § 33E, we have reviewed the entire record and transcript. We conclude that neither a new trial nor a reduction in the verdict is warranted.
Judgments affirmed.
Notes
Assignments of error not briefed are deemed waived.
Stranad
v.
Commonwealth,
Brenda testified that, although the defendant had had some drinks, he was not drunk.
Brenda apparently lived in Arlington at this time.
The Commonwealth’s position as to proof did not deteriorate between the time the Commonwealth rested and the close of all the evidence. See
Commonwealth
v.
Kelley,
Since the defendant was acquitted of murder in the first degree, he argues only the denial of his motions for a directed verdict as to murder in *312 the second degree. See Commonwealth v. Amazeen, ante 73, 81 n.6 (1978).
