Sullivan, J.
After a jury trial, the defendant, John Lacoy, was convicted of murder in the second degree. See G. L. c. 265, § 1. On appeal, he contends that (1) the Commonwealth’s exercise of two of its peremptory challenges violated art. 12 of the Massachusetts Declaration of Rights and the equal protection clause of the United States Constitution; (2) trial counsel was ineffective; (3) prior bad acts were admitted in error; and (4) the judge erred by declining to instruct the jury on the sudden combat theory of voluntary manslaughter and involuntary manslaughter. We affirm.
Background.
We recite the facts as the jury could have found them, noting facts that are disputed, and reserving certain details for our analysis of the issues raised on appeal.
The defendant and the victim, Casey Taylor, met in a homeless shelter. After the defendant found an apartment with two other men, Taylor stayed with him overnight from time to time. The landlord
eventually told the defendant that Taylor was not to come to the house any more. The defendant did not allow Taylor to leave the bedroom or make noise on those nights when the landlord was at home, and required Taylor to urinate in a bottle.
Both men were alcoholics. Over the course of the two years that they knew each other, Taylor sought out the defendant after the defendant’s Social Security disability check had arrived. Taylor wanted money to purchase alcohol. When the defendant received his disability check, the two men were seen on the back porch of the apartment with large bottles of vodka for days at a time. When the alcohol was gone, Taylor left.
The defendant told friends that he was interested in Taylor sexually, even though Taylor was straight. Nine months before Taylor’s death, in a recorded telephone call, the defendant told a friend that he had put pills in the victim’s vodka because he wanted to “molester” Taylor.
The defendant, who testified at trial, admitted that he drugged Taylor because he felt used, and that he was angry. The defendant also admitted that he sexually assaulted Taylor after Taylor drank too much and “blacked out.” He tried to
justify his actions by pointing to Taylor’s habit of using the defendant for his money. He also said that sex was sometimes consensual.
The defendant referred to the victim as a leech, meaning, in the defendant’s words at trial, “he used me a lot” and “he wanted me for my money.” At trial, the defendant admitted that he had threatened to beat up the victim, to hit him over the head with a beer bottle, and to steal his money. Several months before the murder he told one friend, “If he shows up here I’ll murder him.”
On the night of July 31, 2011, the defendant and Taylor were alone in the defendant’s bedroom. A neighbor overheard part of an argument coming from the bedroom, during which the defendant yelled, “I’m sick of you being a leech[.] I’m sick of supporting you[.] [Ljook at you now[.j I’m feeding you now.” There was an altercation, during which the defendant stabbed Taylor in the chest with a knife, perforating his heart. Taylor cried out, “Call 9-.” Instead of calling for help, the defendant dragged Taylor out of the bedroom, down the stairs, and outside the house, and left him to die underneath a latticework enclosure around the stairs that led to the back porch.
The defendant then went back to the bedroom where the stabbing had taken place. He flipped over the bloody mattress, removed and disposed of the bloody sheets and the knife, and fled. Nine days later, Taylor’s decomposing body was discovered after several complaints were lodged that a foul, “nauseating” smell was coming from somewhere near the defendant’s residence.
The cause of death was a single stab wound to the heart. At trial, the issue before the jury was whether the killing was committed with the requisite intent to sustain a charge of murder in the second degree or involuntary manslaughter, or whether the killing was done in self-defense or was accidental.
Needing a place to go and wanting to “hide,” the defendant checked himself into Beth Israel Hospital, professing to be suicidal.
His stated reason for admission was that he felt depressed and drank too much, and too many people were leeching off him. Once admitted, the defendant told a nurse about the stabbing. The defendant said that he had become “annoyed” with Taylor when Taylor had asked him to buy more vodka, and that he then punched
Taylor. Taylor bit the defendant’s finger and punched the defendant, and the defendant then stabbed Taylor, who ran away. He told a similar story to a friend, claiming that Taylor had run away. He told another friend that he and Taylor had passed out on the beach and that Taylor may have been swept out with the tide.
During his stay at the hospital, the defendant sent an electronic mail (e-mail) message to a friend stating “I heard they found Taylo[r’s] courpse [sic11.| I’m glad[.] No[w] he will not leach [s/c] off me anymore[.]” The e-mail was sent six days
before
Taylor’s body was discovered by the police.
The defendant lied to his friends about Taylor’s whereabouts, and about how (and whether) Taylor had died, even after Taylor’s body was discovered at the defendant’s residence on August 9, 2011. Recorded telephone calls were introduced at trial, in which the defendant admitted to killing Taylor and said that he would “make stuff up.”
On August 16, 2011, fifteen days after the killing, and seven days after the discovery of the body, he admitted to one friend that he had “got [Taylor] once . . . right under the heart” and “dragged him down the back stairs, threw him underneath.”
The theory of the defense was that the stabbing was either in self-defense or accidental. The defendant testified that he purchased alcohol on the day of the killing. He and Taylor drank together at the defendant’s home, and then went to the beach and drank some more. Upon their return to the defendant’s home, the defendant prepared chicken for the two of them. He brought the plate of chicken, together with a knife and fork, to the defendant’s bedroom, where Taylor was waiting. Complaining that he wanted more “booze,” Taylor threw the plate of food across the bedroom, and then attacked the defendant with a metal box fan, hitting him in the shoulder and the side of his head. Taylor jumped on top of the defendant, tried to strangle him, and bit one of his fingers. At that point, the defendant pulled his finger from Taylor’s mouth, and the knife that the defendant brought with the chicken “fell into his body accidentally.” The defendant also testified that he stabbed Taylor “to get him off of me” and that he was “protecting himself from getting killed.”
Discussion.
1.
Peremptory challenges.
The defendant contends that the judge’s allowance of the Commonwealth’s peremptory
challenges of an African-American female juror (juror no. 165) and a gay African-American male juror (juror no. 179) denied him his right to a jury selection process free from invidious discrimination. “The use of peremptory challenges to exclude prospective jurors solely because of bias presumed to derive from their membership in discrete community groups is prohibited both by art. 12 [of the Massachusetts Declaration of Rights] . . . and the equal protection clause [of the United States Constitution].”
Commonwealth
v.
Issa,
466 Mass. 1, 8 (2013) (citations and quotation omitted). See
Commonwealth
v.
Soares,
377 Mass. 461, 486-488, cert. denied, 444 U.S. 881 (1979);
Batson
v.
Kentucky,
476 U.S. 79 (1986)
(Batson).
“The Constitution forbids striking even a single prospective juror for a discriminatory purpose.”
Foster
v.
Chatman,
136 S. Ct. 1737, 1747 (2016) (quotation omitted).
A defendant may “object to the use of a peremptory challenge without regard to whether the defendant and the excused juror are of the same race.”
Sanchez
v.
Roden,
753 F.3d 279, 292 (1st Cir. 2014), citing
United States
v.
Mensah,
737 F.3d 789, 797 (1st Cir. 2013), cert. denied, 134 S. Ct. 1912 (2014). See
Powers
v.
Ohio,
499 U.S. 400, 402 (1991)
{Powers).
The defendant is entitled to a choice of jurors free of the taint of racial bias.
Miller-El
v.
Dretke,
545 U.S. 231, 237-238 (2005). The defendant is also entitled to assert the right of each juror to sit under the equal protection clause of the United States Constitution.
Powers, supra
at 415.
“There is a presumption that the exercise of a peremptory challenge is proper. That presumption may be rebutted, however, if [the objecting party shows] that (1) there is pattern of excluding members of a discrete group; and (2) it is likely that individuals are being excluded solely because of their membership in this group.”
Commonwealth
v.
Benoit,
452 Mass. 212, 218 (2008)
(Benoit).
In addition, “[a] single peremptory challenge may be sufficient to make a prima facie showing,” where the circumstances of the challenge so indicate.
Ibid.
“Once an issue is raised concerning an improper use of a peremptory challenge, ‘the judge must make a finding as to whether a prima facie showing of an improper use . .. has been made.’ ”
Commonwealth
v.
Rodriguez,
457 Mass. 461, 471 (2010)
(Rodriguez),
quoting from
Commonwealth
v.
Maldonado,
439 Mass. 460, 463 (2003)
(Maldonado).
If that showing is made, the burden shifts to the party making the peremptory challenge to “provide a group-neutral reason.”
Benoit, supra
at 219 (citation omitted). The proponent of the challenge “must give a ‘clear and reasonably specific’ explanation of his ‘legitimate reasons’ for exercising the challenges.”
Commonwealth
v.
Burnett,
418 Mass. 769,
771
(1994), quoting from
Batson, supra
at 98 n.20. To be bona fide, reasons must be both “adequate” and “genuine.”
Benoit, supra
at 219-220. “The judge should make ‘specific findings’ or provide an ‘explanation’ ascertainable to an appellate court concerning whether the reason for removal offered by the challenging party is both adequate and genuine.”
Rodriguez, supra
at 471, quoting from
Maldonado, supra
at 465-466.
a.
Juror no. 165.
After the individual voir dire of juror no. 165, an African-American woman, the Commonwealth exercised a peremptory challenge.
The judge, sua sponte, noted that the Commonwealth had already challenged “one black female and one black male[, a]nd this would be the second black female.”
The judge sought an explanation, and the prosecutor offered one: that the juror worked at Beth Israel Hospital, the hospital to which the defendant had been admitted. After expressing some skepticism about the explanation given, but accepting its truth, the judge allowed the challenge, stating, “[Wjere we involved with a [d]e-fendant that [s/c] was African American I would not permit the challenge. But here I will. Although I think it’s very marginal. Okay.”
Defense counsel did not object at any time. See Rule 6 of
the Rules of the Superior Court (1989).
The defendant, citing
Powers, supra,
contends that the judge’s ruling was error because it was based on the mistaken premise that a white defendant is not entitled to make a
Soares-Batson
challenge.
Looking at the colloquy as a whole, see note 8,
supra;
note 11,
infra,
there are two possible interpretations of the judge’s ruling. The first is that the experienced judge raised, sua sponte, the issue of discriminatory peremptory challenges. He mentioned the possibility of both conscious and unconscious bias
— clearly a nuanced approach to the challenge.
’
He made a finding of a pattern, and made findings on genuineness and adequacy under the second prong of
Soares-Batson.
That is, he would have found the explanation inadequate and therefore discriminatory if the defendant had been African-American, but did not find the marginal reason offered to be discriminatory where the defendant was white. As the United States Supreme Court stated in
Powers, supra,
“Racial identity between the defendant and the excused person might in some cases be the explanation for the prosecution’s adoption of the forbidden stereotype, and if the alleged race bias takes this form, it may provide one of the easier cases to establish both a prima facie case and a conclusive showing that wrongful discrimination has occurred. But to say that the race of the defendant may be relevant to discerning bias in some cases does not mean that it will be a factor in others, for race prejudice stems from various causes and may manifest itself in different forms.”
Id.
at 416. One possible view of the judge’s ruling is that it was not based on an error of law or impermissible considerations.
Alternatively, even if we were to read the judge’s ruling to give inadequate consideration to the juror’s right to sit, or to a white defendant’s entitlement to raise a
Batson
challenge (as the defendant urges us to do), counsel’s failure to object to the judge’s ruling poses an additional appellate challenge.
Batson
held that, on remand, if the prosecution’s peremptory challenges were found to be discriminatory, relief would be required without a showing of prejudice.
Batson,
476 U.S. at 100. However, in
Batson
there was “timely objection.”
Ibid.
In the absence of objection, “even structural errors can be waived when they are
not properly preserved.”
Commonwealth
v.
Petetabella,
459 Mass. 177, 186 n.9 (2011) (in dicta, discussing waiver of exclusion of women from jury).
Cf.
Commonwealth
v.
Burnett,
428 Mass. 469, 476 (1998) (waiver of error in reasonable doubt instruction; “structural error objections can be waived”);
Commonwealth
v.
Vargas,
475 Mass. 338, 357 (2016), and cases cited (waiver of right to public trial). Here the defendant did not object at any time during trial, and did not signal in any way that he was dissatisfied with the judge’s decision.
Accordingly, even if there were error, the objection was waived. We review for a substantial risk of a miscarriage of justice. See generally
Commonwealth
v.
Berardi,
88 Mass. App. Ct. 466, 473 (2015). There is no evidence of the racial composition of the venire or the jury panel. There is no evidence that the jury seated were unrepresentative, unfair, or biased in any way. The defendant has not shown that there is a “serious doubt” as to the impartiality of the jury, and has therefore not demonstrated a substantial risk of a miscarriage of justice. See
Commonwealth
v.
Millien,
474 Mass. 417, 432 (2016).
b.
Juror no. 179.
On the first day of jury empanelment, juror no. 179, a gay African-American man, was seated on the jury with
out challenge. On the second day of empanelment, after the Commonwealth had an opportunity to check the probation records of the jurors seated on the first day, the Commonwealth alerted the judge that juror no. 179 had a more extensive criminal record than he had reported. The defendant stated on his juror questionnaire that he had been charged with disorderly conduct, a charge which had been dismissed. However, his probation record revealed that he had also been charged with several other crimes, including four assault and battery offenses, one with a dangerous weapon; two larceny offenses; a compulsory insurance violation; a number plate violation; resisting arrest; and malicious destruction of property, all of which had been continued without a finding, dismissed, or withdrawn. Two restraining orders had been issued against him.
The judge conducted a voir dire of the prospective juror. When asked about the other charges, juror no. 179 responded that he did not list them in the questionnaire because they had been dismissed. The Commonwealth exercised a peremptory challenge, arguing that the omissions were substantial, and the restraining orders were not reported at all. The defendant objected, noting that the restraining orders “go back six, seven years,” that it was understandable for juror no. 179 to omit charges that were dismissed or withdrawn, and that “one gay on the jury would be, you know, helpful to talk with the jury.”
The judge concluded that the reason given by the prosecutor was the true reason for the challenge, was based solely on the juror’s inaccurate reporting, and was not a pretext for discrimination on the basis of sexual orientation.
These findings addressed both the soundness of the rationale proffered and the
genuineness of the reasons given. The reasons were specific to the juror and unrelated to whether he was gay
or black. In light of the nature of the offense, the omission of the restraining orders was particularly relevant. The judge did not abuse his discretion in excusing the juror. See
Rodriguez,
457 Mass. at 473-474 (dismissal of juror for failing to disclose her own experience with violent crime and her son’s prior criminal record).
2.
Ineffective assistance of counsel.
The defendant argues that defense counsel’s “weird and bigoted dwelling on defendant’s homosexuality” in his opening statement and closing argument constituted ineffective assistance of counsel.
The prosecutor began her opening statement with the following sentence: “Ladies and gentlemen, words cannot prepare you for what you are about to hear.” She then summarized the facts in outline form, emphasizing the nonconsensual sex between the defendant and Taylor, and the abandonment of Taylor beneath the house. Defense counsel sought to undercut the prosecutor’s portrayal of his client, describing him as a “[mjarginally retarded” individual who had been taken advantage of by Taylor. However, after suggesting that the facts were embellished by the prosecutor, defense counsel went on to say:
“However, what the evidence will show, and you should
prepare yourselves, will be a descent into obscure obsoles
cence of the abnormal psychology variety. This is a case of homosexual behavior and alcoholism.
That’s really what the case is about, and certainly when the [cjourt, His Honor, Judge Brassard, asked you about homosexual behavior and that variety, he said, well, it may contain the evidence the way it is.
I mean, that is the behavior of gay homosexual men. . . .
Anyway, for
whatever disconcerting and sexual behavior you will hear
— and it is lewd, it is sometimes open and lascivious in public.
It is disgusting, obscene, you know, beyond reason even of any heterosexual act when in public.
But in private, it is what it is. However, with any of those acts, it never broke up the couple. They were bombed out of their minds in Braintree, in East Boston, in Revere, in Quincy, a lot.” (Emphasis added.)
In his closing argument, defense counsel again returned to this theme, asking the jury not to be distracted by the testimony concerning sexual conduct, and to focus solely on the murder charge. However, as he did in his opening statement, defense counsel continued to make additional remarks.
‘“Ladies and gentlemen of the jury, when I made an opening statement to you
I told you that we would be descending into the depravity area of the world into some form of abnormal psychology.
Well, we did and certainly a lot of that is propelled by the evidence proffered by the government.
And there was a lot of, you know, lewd, lascivious, florid, obscene behavior.
And they brought it out anyway. . . .
‘“And we’ve heard, well, every part of the disparaging aspect of it all that we could see.
Trying to make Mr. Lacoy a demon. Loathsome, diabolical, malevolent, horrible, horrible, evil. It has n oth ing to do with the elem en ts of h om icide. Not all. They know it. Shoved it into your face anyway. Please, don’t fall for that. Don't fall for that.
It’s a common sense case, please, got to get it out of your mind. It’s for another day. Today, it’s homicide. It’s about the story in the bedroom.” (Emphasis added.)
‘“[TJhe burden of proving ineffectiveness rests with the defendant.”
Commonwealth
v.
Kolenovic,
471 Mass. 664, 673 (2015) (Kolenovic), quoting
Commonwealth
v.
Montez,
450 Mass. 736, 755 (2008). ‘“Counsel is ineffective where his conduct falls ‘below that which might be expected from an ordinary fallible
lawyer’ and prejudices the defendant by depriving him ‘of an otherwise available, substantial ground of defence.’ ”
Commonwealth
v.
Lavoie,
464 Mass. 83, 89 (2013), quoting from
Commonwealth
v.
Saferian,
366 Mass. 89, 96 (1974). In assessing the second prong of
Saferian,
“a defendant is entitled to a new trial ‘if we have a serious doubt whether the result of the trial might have been different had the error not been made.’ ”
Millien,
474 Mass. at 432, quoting from
Commonwealth
v.
Azar,
435 Mass. 675, 685 (2002).
It is evident even from the bare record that counsel’s choice was a tactical one.
Faced with the likelihood that the relationship between the two men, the sexual assaults, and the abandonment of the dying Taylor would all come in to evidence, defense counsel made a tactical decision to try to deflate those arguments from the beginning, and again at the end, with his admonition not to “fall for that.”
See
Commonwealth
v.
Beauchamp,
49 Mass. App. Ct. 591, 612 (2000) (“Counsel’s opening was a reasonable strategy in light of his realization that the Commonwealth would inevitably make the jury aware of that testimony”) Cf.
Commonwealth
v.
Durakowski,
58 Mass. App. Ct. 92, 93 (2003) (“a defendant is not necessarily deprived of a defense when some guilt is conceded”).
“Where, as here, the defendant’s ineffective assistance of counsel claim is based on a tactical or strategic decision, the test is whether the decision was manifestly unreasonable when made.”
Kolenovic, supra
at 674 (quotations and citation omitted). While the strategic decision itself may have been a reasonable one, we understand the argument on appeal to be that the
manner
of making the argument was manifestly unreasonable, because it indulged in gross and discriminatory stereotype, and was condemnatory of the defendant. We do not condone presentation of incompetent generalizations and baseless, florid characterizations that did not have, and would not reasonably be expected to have,
any factual basis in the evidence. See Mass. R. Crim. R 24, 378 Mass. 895 (1979); Reporters’ Notes to Rule 24, Mass. Ann. Laws Court Rules, Rules of Criminal Procedure, at 1605-1606 (LexisNexis 2015). See also Mass. G. Evid. § 1113 (a)(1) & note (2016), citing
Commonwealth
v.
Fazio,
375 Mass. 451, 454 (1978), and
Commonwealth
v.
Croken,
432 Mass. 266, 268 (2000). However, even if we assume that this much of the strategic judgment regarding the manner of presentation was manifestly unreasonable when made, the evidence was quite simply overwhelming. The defendant’s prior recorded statements, his emails, his efforts to cover up and mislead, and his admissions at trial provided ample basis for the conviction, and we do not have a serious doubt as to whether the result of the trial would have been different if the offending statements had not been made.
3.
Prior bad acts.
The defendant contends that the judge erred in allowing the Commonwealth to admit evidence of prior bad acts that showed that the defendant had sexually assaulted Taylor on several occasions. The defendant points to four instances of prior bad acts: (1) about one year before the killing, the defendant “attempted to open the person’s pants” while that person was sleeping, and that person “woke up, screaming and yelling, I’m not gay, you don’t do that, I’m not into that”; (2) the defendant “knew [that Taylor] was a [heterosexual] guy but he liked having sex with [Taylor]” anyway; (3) the defendant’s admission on cross-examination that on several occasions he had sexually assaulted Taylor after Taylor had “blacked out” from drinking excessively; and (4) the underwear that was found on Taylor’s
corpse was torn on the backside.
“Evidence of a defendant’s prior . . . bad acts is inadmissible for the purpose of demonstrating the defendant’s bad character or propensity to commit the crimes charged. . . . However, such evidence may be admissible ... ‘to establish motive, opportunity, intent, preparation, plan, knowledge, identity, or pattern of operation.’ ”
Commonwealth
v.
Crayton,
470 Mass. 228, 249 (2014)
(Crayton),
quoting from
Commonwealth
v.
Walker,
460 Mass. 590, 613 (2011)
(Walker).
“Other bad acts” evidence should be excluded where “the risk of unfair prejudice outweighs its probative value.”
Crayton, supra
at 249 n.27.
Before trial, the Commonwealth moved to admit the evidence to show the relationship between the defendant and Taylor. The Commonwealth argued, and the judge agreed, that the evidence that the defendant sexually assaulted Taylor and may have sexually assaulted another individual was relevant to the defendant’s state of mind and intent, and was not unduly remote. The evidence was directly relevant to the Commonwealth’s theory, namely that the defendant was angry at Taylor for “leeching” off him and for refusing to engage in consensual sex with him, and to rebut the defenses of self-defense and accident. See
Commonwealth
v.
Butler,
445 Mass. 568, 574-575 & n.6 (2005), and cases cited (hostile nature of relationship). Cf.
Commonwealth
v.
Sharpe,
454 Mass. 135, 144 (2009)
(Sharpe)
(evidence of abuse of former girlfriend admissible in case of murder in first degree of current girlfriend to show pattern of hostility based on arguments over money and progression of violence).
The judge clearly in
structed the jury regarding the proper use of the evidence on two occasions, i.e., during the presentation of the evidence and before deliberations. “We leave to the judge’s sound discretion whether the probative value of the evidence outweighs the risk of unfair prejudice. . . . and conclude that the judge did not abuse his discretion by admitting this testimony.”
Walker, supra
at 613 (citation omitted).
4.
Jury instructions.
The defendant asserts that the judge erred by declining to give an instruction on sudden combat and on involuntary manslaughter. The judge instructed the jury on self-defense, accident, and manslaughter by reason of provocation and use of excessive force in self-defense.
Sudden combat has been described as follows: “[wjhen two meet, not intending to quarrel, and angry words suddenly arise, and a conflict springs up in which blows are given on both sides, without much regard to who is the assailant, it is a mutual combat. And if no unfair advantage is taken in the outset, and the occasion is not sought for the purpose of gratifying malice, and one seizes a weapon and strikes a deadly blow, it is regarded as homicide in heat of blood.”
Commonwealth
v.
Rodriquez,
461 Mass. 100, 107 (2011), quoting from
Commonwealth
v.
Webster,
5 Cush. 295, 308 (1850). The defendant’s testimony, that Taylor attacked him and then “fell” into the knife by “accident,” was inconsistent with a theory of sudden combat. See
ibid.
“Involuntary manslaughter is an unlawful homicide unintentionally caused by an act which constitutes such a disregard of probable harmful consequences to another as to amount to wanton or reckless conduct.”
Commonwealth
v.
Life Care Centers of America, Inc.,
456 Mass. 826, 832 (2010) (quotation and citation omitted). “Although our cases state frequently that the essence of wanton or reckless conduct is intentional conduct, . . . reckless conduct does not require that the actor intend the specific result of his or her conduct, but only that he or she intended to do the reckless act.... Accordingly, when we refer to the intent required to support a conviction of involuntary manslaughter, we refer to the intent to perform the act that causes death and not the intent that a death occur.”
Ibid.
(citations and quotations omitted). As the judge noted at trial, the defendant testified that he did not
intend to stab the victim. This testimony supported the defense of accident, but did not form the basis for asserting that he engaged in conduct which involved a high degree of likelihood that substantial harm will result to another.
Id.
at 836 (“the crime of involuntary manslaughter requires an act taken in disregard of a high probability of harm to others so that the act is wanton or reckless”).
There was no error in declining to give the instructions.
Judgment affirmed.