Commonwealth v. DePina ( 2017 )


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    SJC-11794
    SJC-11932
    COMMONWEALTH vs. ESAU DePINA.
    COMMONWEALTH vs. ISAIAH MONTEIRO.
    Plymouth.         November 10, 2016. - March 13, 2017.
    Present:   Gants, C.J., Lenk, Hines, & Lowy, JJ.
    Homicide. Firearms. Evidence, Testimony before grand jury,
    Hearsay, Admission by silence, Statement of codefendant,
    Joint venturer, Prior misconduct, Immunized witness, Third-
    party culprit, Expert opinion. Constitutional Law,
    Confrontation of witnesses. Joint Enterprise. Practice,
    Criminal, Capital case, Confrontation of witnesses,
    Hearsay, Conduct of prosecutor, Opening statement,
    Instructions to jury, Severance, Trial of defendants
    together.
    Indictments found and returned in the Superior Court
    Department on November 10, 2010.
    The cases were tried before Richard J. Chin, J.
    Rosemary Curran Scapicchio for Esau DePina.
    Stephen Neyman for Isaiah Monteiro.
    Audrey Anderson, Assistant District Attorney, for the
    Commonwealth.
    2
    LENK, J.    After a jury trial in the Superior Court, the
    defendants, Isaiah Monteiro and Esau DePina, were each found
    guilty of murder in the first degree on a theory of deliberate
    premeditation, as well as of related offenses, in the shooting
    death of the victim, Anthony Hamilton, on November 16, 2009.1      In
    this direct appeal, they challenge the substantive admission of
    a witness's grand jury testimony, various statements in that
    testimony they claim are independently inadmissible, certain
    portions of the prosecutor's opening statement, the jury
    instructions on immunized witness testimony, and the denial of
    their motions to sever; they also raise various evidentiary
    issues.   In addition, both defendants seek relief under G. L.
    c. 278, § 33E.   We discern no error warranting reversal, and,
    having carefully reviewed the record, see no reason to reduce or
    set aside the verdicts under G. L. c. 278, § 33E.      Accordingly,
    we affirm the defendants' convictions.
    1.   Background and proceedings.    a.   Facts.   We recite the
    facts that the jury could have found, reserving certain details
    for later discussion.   On November 16, 2009, at approximately
    1
    Esau DePina also was convicted of four charges of armed
    assault with the intent to murder, unlawful possession of a
    firearm, unlawful possession of ammunition without a firearm
    identification card, and discharge of a firearm within 500 feet
    of a building. Isaiah Monteiro also was convicted of unlawful
    possession of a firearm and unlawful possession of ammunition,
    and acquitted of four charges of assault with intent to murder
    and one charge of discharging a firearm within 500 feet of a
    building.
    3
    1 P.M., the victim was with several of his friends on the front
    porch of a house on Johnson Court in Brockton.    A man approached
    on foot and shot him.    Witnesses near the scene -- neighbors, a
    carpenter, and the driver of a passing vehicle -- described
    hearing at least three gunshots and seeing a man running,
    climbing through a hole in a fence, and getting into a waiting
    vehicle.    None of the witnesses was able to provide more than a
    general description of that individual, whom most described as a
    relatively dark-skinned male in a gray hooded sweatshirt.
    No bullets were recovered from the victim's body, but
    fifteen cartridges, eight spent shells, and three lead fragments
    were found at the scene.    A State police ballistics expert
    determined that all of the shots were fired by the same gun,
    likely a .40 caliber semiautomatic pistol, but were unable to
    identify a specific weapon or manufacturer.    Forensic examiners
    also took cast impressions of four partial footprints found near
    the location where the fleeing man had climbed through a fence,
    but investigators were unable to determine the precise size or
    brand of the shoe that made the impression.
    With few leads, there was little progress in the
    investigation for several months.   In the summer of 2010, police
    spoke with Licea DaSilva, Monteiro's girl friend at the time of
    the shooting.   Police also spoke with Kevin Dossanto, Monteiro's
    cousin.    From their statements, police learned that Monteiro had
    4
    been "jumped" by the victim and the victim's brother some time
    before the shooting.    They also learned that Monteiro and DePina
    had spent the weekend before the shooting at a hotel in
    Brockton, with DaSilva and others.   DaSilva, who had been
    consuming alcohol and drugs, saw Monteiro with a handgun and
    "shells" in the room.
    On the following Monday morning, Monteiro and DaSilva drove
    to the school she attended.    DaSilva gave Monteiro permission to
    use her vehicle for the rest of the day, and asked him to bring
    her lunch.   Dossanto later went with Monteiro to the hotel and
    to deliver lunch to DaSilva.   En route, they picked up DePina.
    When they dropped her lunch off at school, DaSilva noticed that
    DePina was wearing a gray hooded sweatshirt, which she thought
    was strange given the weather.   The three men then continued
    "joy riding" around Brockton, while listening to music and
    smoking marijuana.
    At some point, Dossanto noticed that they had entered the
    north side of Brockton.   This was a part of the city they
    generally avoided because of a "beef" between residents who grew
    up on the north side and those, like Dossanto, Monteiro, and
    DePina, who grew up on the south side.    When Dossanto asked why
    they were on the north side, Monteiro told him not to worry
    about it.
    5
    As they were driving near Johnson Court, Monteiro pointed
    out a group of people standing on the street.    After passing
    Johnson Court, Monteiro pulled over and DePina got out of the
    vehicle.    Less than one minute later, Dossanto heard multiple
    gunshots.    DePina returned to the vehicle almost immediately
    thereafter and said, "I think I got him."   Monteiro said "are
    you sure" or "all right."   DePina replied that they had "to get
    the hell out" of the area, and Monteiro drove to a mutual
    friend's house.   When Dossanto asked what had happened, Monteiro
    replied that "shit popped off," which Dossanto understood to
    mean that someone had been shot.    When he attempted to ask more
    about it, Monteiro told him to "[s]top acting like a bitch."
    Later that day, Monteiro and DePina returned to pick up
    DaSilva at her school.    Soon after getting into the vehicle,
    DaSilva received a telephone call from her sister, Anita
    Rodriguez, telling her of the shooting and the victim's death,2
    and asking to be picked up at their house near Johnson Court.
    DePina and Monteiro said that they did not want to go to the
    north side of town, and particularly did not want to go near
    Johnson Court because they had a "beef" with people in that
    area, but ultimately did go with DaSilva to get her sister.       At
    her sister's urging, DaSilva then drove past the scene of the
    2
    DaSilva, who was from the north side of Brockton, and the
    victim were friends.
    6
    shooting.    The defendants appeared nervous and DaSilva's sister
    asked them, "[I]f you didn't do it, what's the big deal?," to
    which neither responded.3
    b.     Pretrial proceedings.   Prior to trial, the defendants
    filed a number of motions concerning the anticipated evidence at
    trial.    While some were allowed, many were denied.   Among those
    denied were motions to sever, to exclude testimony that DaSilva
    had seen Monteiro with a gun the weekend before the shooting, to
    introduce testimony concerning a violent altercation between the
    victim and an unknown individual shortly before his death, and
    to admit testimony from an individual who had been planning to
    purchase heroin from the victim later on the day he was killed.
    After the jury were empanelled but before opening
    statements, DaSilva, whom the Commonwealth had summonsed to
    testify, asserted her right to remain silent under the Fifth
    Amendment to the United States Constitution and art. 12 of the
    Massachusetts Declaration of Rights.      Appointed counsel
    maintained, among other things, that inconsistencies between
    DaSilva's grand jury testimony and the testimony she intended to
    give at trial would expose her to perjury charges.      The judge
    held an in camera hearing on the validity of this claim (Martin
    hearing).     See Commonwealth v. Martin, 
    423 Mass. 496
    , 504
    3
    It was not clear whether Rodriguez's question was directed
    at one or both of the defendants.
    7
    (1996).   At the hearing, DaSilva spoke freely; among other
    things, she mentioned her fear of testifying, and she claimed
    that police coerced her into falsely telling the grand jury that
    she had seen Monteiro with a gun the weekend before the killing.
    On this basis, the judge determined that DaSilva had asserted a
    valid claim under the Fifth Amendment as, were she to testify to
    the contrary, she "necessarily" would admit to perjury.        The
    Commonwealth then obtained a grant of immunity and an order that
    DaSilva testify at trial.   Thereafter, and before opening
    statements were made, DaSilva's counsel said that she was
    willing to do so.
    c.    Proceedings at trial.    The prosecutor's opening
    statement focused largely on the evidence that DaSilva and
    Dossanto had provided to the grand jury and to which it was
    expected they would testify at trial.     In addition to key
    testimony from the two, one of whom proved to be uncooperative,
    a series of witnesses testified to hearing gun shots and seeing
    a man running, climbing through a fence, and entering a vehicle
    around the time of the shooting.     Investigating officers
    testified to their efforts to obtain and examine physical
    evidence, largely consisting of the inconclusive cartridges,
    shells, and footprints.
    Dossanto was the primary source of information concerning
    the events on the day of the shooting.    Among other things, he
    8
    testified that he had been in the vehicle with Monteiro and
    DePina on that day, with Monteiro driving and DePina a
    passenger.   The group drove around town, eventually arriving at
    Johnson Court, where Monteiro pointed out a group of people, and
    parked the vehicle.   DePina got out and disappeared from view,
    and Dossanto then heard several gunshots.   DePina returned
    immediately thereafter, got into the vehicle, and told Monteiro
    to leave the scene.   As they were driving away, Monteiro told
    Dossanto that "shit popped off."
    On direct examination, Dossanto acknowledged that he had
    not come forward earlier with this information because he feared
    retaliation if he cooperated with police.     On cross-examination,
    Dossanto conceded that he did not speak to police until they
    approached him nine months after the shooting, and told him that
    he was a "person of interest" in the investigation.     He
    initially told police that he had "nothing to do with" the
    shooting, and that he did not know DaSilva.    After police told
    him that they knew he had been with Monteiro and DePina that
    day, and that he had "better start talking" to avoid being sent
    to prison, however, he implicated Monteiro and DePina by
    "fill[ing] in the blanks" for the police interviewers.
    During the first day of DaSilva's testimony, she stated, as
    she had at the Martin hearing, that her testimony before the
    grand jury had been coerced, and asserted multiple times that
    9
    she did not remember events to which she had testified at the
    grand jury.4   The judge conducted a voir dire examination to
    ascertain whether, pursuant to Commonwealth v. Daye, 
    393 Mass. 55
    (1984), overruled on another ground by Commonwealth v.
    Cong Duc Le, 
    444 Mass. 431
    (2005), and its progeny, DaSilva's
    grand jury testimony was admissible substantively.   During that
    examination, DaSilva continued to maintain that she did not have
    an independent memory of certain events, alluding to a learning
    disability that affected her abilities in this regard.     The
    examination ended with DaSilva running out of the court room.
    The judge continued the trial until the following day, ordered
    DaSilva held overnight in custody, and found her in contempt.
    Her attorney informed the judge the following morning that,
    prior to testifying the preceding day, DaSilva had been
    threatened in the hallway, but nonetheless would be willing to
    testify.   When direct examination resumed, however, she
    continued to maintain that she could not remember most of the
    events on the weekend prior to, and the day of, the shooting.
    This led to a second voir dire examination at which DaSilva
    continued to claim that she was unable to remember certain
    events, and that her statements before the grand jury had been
    4
    The jury heard that DaSilva had received immunity for her
    testimony, although they were not told when she was given that
    immunity. During the judge's final charge, they were told that
    they could consider the grant of immunity in weighing her
    credibility.
    10
    coerced.   On cross-examination by defense counsel, she was able
    to recount considerably more information than on direct
    examination by the Commonwealth.     Discrediting DaSilva's memory
    loss as feigned, the judge allowed portions of her grand jury
    testimony to be admitted substantively, on "a question by
    question basis."
    2.     Discussion.   The defendants raise several claims of
    error on appeal.    They challenge the substantive admission of
    DaSilva's grand jury testimony on both evidentiary and
    constitutional grounds, and also claim that such testimony
    contained several independently inadmissible portions.      They
    assert error as well in six further respects:     (a) the
    prosecutor's opening statement; (b) the judge's instructions
    concerning immunized witness testimony; (c) the denial of a
    motion to sever; (d) the partial denial of a motion to introduce
    third-party culprit evidence; (e) the testimony of a ballistics
    expert; and (f) Dossanto's testimony as to his fear of
    testifying.   Both defendants also seek relief under G. L.
    c. 278, § 33E.
    a.     Admission of DaSilva's grand jury testimony.     The
    defendants claim that the admission of DaSilva's grand jury
    testimony as substantive evidence, to which they objected at
    trial, was error.    In light of the paucity of physical evidence
    and the Commonwealth's resulting reliance on DaSilva's
    11
    testimony, as well as that of Dossanto, the defendants maintain
    that this was prejudicial error warranting a new trial.
    The defendants suggest two reasons why admission of the
    grand jury testimony was error.   First, both maintain that the
    judge's findings were inadequate to satisfy the prerequisites
    for admissibility of grand jury testimony as set forth in 
    Daye, 393 Mass. at 73-74
    , and Commonwealth v. Sineiro, 
    432 Mass. 735
    ,
    745 & n.12 (2000).   Specifically, they claim that the judge
    failed to make necessary findings that DaSilva's testimony was
    not coerced.   Second, Monteiro argues that the admission of such
    testimony was in violation of the confrontation clause of the
    Sixth Amendment to the United States Constitution.   After
    considering each of these contentions, we turn to the
    defendants' argument that, even if not erroneously admitted on
    these grounds, four specific portions of the testimony should
    have been excluded on evidentiary grounds.
    i.   Prerequisites for substantive admission of grand jury
    testimony.   When a witness, who is on the stand and therefore
    available for cross-examination, testifies to a lack of memory,
    his or her previous testimony before the grand jury may be
    admitted substantively if the judge determines that three
    conditions have been met.   The judge must find, first, that the
    witness is in fact feigning his or her lack of memory; second,
    that the grand jury testimony was not coerced; and, third, that
    12
    the grand jury testimony was in the witness's own words,
    involving more than mere confirmations or denials of statements
    made by the interrogator.5    See Commonwealth v. Maldonado, 
    466 Mass. 742
    , 754-755, cert. denied, 
    134 S. Ct. 2312
    (2014), citing
    
    Sineiro, 432 Mass. at 745
    & n.12, and 
    Daye, 393 Mass. at 75
    .       A
    trial judge's findings on these issues are entitled to
    substantial deference and are "conclusive as long as . . .
    supported by the evidence."    
    Maldonado, supra
    at 756, quoting
    
    Sineiro, supra
    at 742 n.6.
    In this case, the judge's determination that DaSilva's
    statement to the grand jury met the requirements to be admitted
    substantively is "supported by the evidence."    
    Maldonado, supra
    ,
    quoting 
    Sineiro, supra
    .   As to the first prerequisite, feigned
    memory loss, there is little question that the evidence amply
    supports the judge's finding.    The judge noted that, at the
    Martin hearing, DaSilva had remembered relevant events and
    similarly could recount events when asked about them during the
    voir dire examination by defense counsel.    He noted also that
    5
    In Commonwealth v. Daye, 
    393 Mass. 55
    , 75 (1984),
    overruled on other grounds by Commonwealth v. Cong Duc Le, 
    444 Mass. 431
    (2005), we identified an additional requirement:
    where grand jury testimony relates to an essential element of
    the offense, the Commonwealth must offer corroborative evidence,
    in addition to that testimony, in order to sustain a conviction.
    While we have sometimes called this a fourth prerequisite, in
    fact the requirement goes to the sufficiency of the evidence
    rather than to its admissibility. See Commonwealth v. Clements,
    
    436 Mass. 190
    , 193 (2002).
    13
    DaSilva had indicated her desire not to get "involved," and had
    reasons that might cause her to feign memory loss.6
    As to the second prerequisite, the judge did not expressly
    find that DaSilva's grand jury testimony was not coerced, nor
    was he requested to do so.   Although an express finding is, of
    course, to be preferred, it is not essential where the evidence
    supports the judge's implicit finding that DaSilva had not been
    coerced.7   See 
    Maldonado, 466 Mass. at 756
    .    Where, as here, a
    judge demonstrates familiarity with the requirements for the
    substantive admission of grand jury testimony based on a feigned
    loss of memory, the admission of the testimony implies a factual
    finding that it was not coerced.   See 
    id. This comports
    with
    the general principle that a judge's ruling on an ultimate issue
    implies resolution of subsidiary factual issues in favor of the
    prevailing party.   See Commonwealth v. Grandison, 
    433 Mass. 135
    ,
    137 (2001), and cases cited; Commonwealth v. Lanoue, 
    392 Mass. 6
           At the first voir dire, the judge commented, "I have
    observed her in-camera. She doesn't have a problem with memory.
    You can see from the transcript, she specifically gave me
    reasons why she didn't want to testify. She is up here and even
    when I am questioning her, she thinks this is a game."
    7
    During oral argument before us, counsel for DePina urged
    that, where, as here, a witness's claim of coercion was
    uncontroverted, the judge must make a specific finding that he
    or she does not credit that claim in order to make a finding
    that there was no coercion. We decline to adopt this
    suggestion.
    14
    583, 588 (1984), S.C., 
    400 Mass. 1007
    (1987) and 
    409 Mass. 1
    (1990).
    The judge had observed DaSilva over two days, having
    conducted both a Martin hearing and two voir dire examinations.
    While, at the time of the judge's ruling, DaSilva's consistent
    claim of police coercion had not been controverted,8 the judge
    was nonetheless not required to credit it.    Cf. 
    Maldonado, 466 Mass. at 756
    (judge entitled not to credit claim of coercion).
    He had found DaSilva generally not credible, and already had
    determined that her claimed lack of memory was a sham, observing
    that she "thinks this [trial] is a game," and noting that she
    did not have the same loss of memory when responding to defense
    counsel or when testifying in camera.    The final Daye-Sineiro
    requirement was met by DaSilva's testimony, in her own words,
    before the grand jury; she plainly did far more than confirm or
    deny the prosecutor's questions.   See 
    id. The defendants
    do not
    argue otherwise.
    ii.   Confrontation clause.   Monteiro claims that, due to
    DaSilva's asserted lack of memory, he was unable to cross-
    examine her on the substance of her testimony, in violation of
    the confrontation clause.   This claim is without merit.
    8
    The prosecutor later presented evidence from police
    officers denying any coercion of DaSilva.
    15
    Where a witness testifies at trial and is cross-examined,
    any limitation on the effectiveness or substance of that cross-
    examination stemming from feigned memory loss generally does not
    implicate the confrontation clause.     See, e.g., Commonwealth v.
    Figueroa, 
    451 Mass. 566
    , 576 (2008).    See also Cong Duc 
    Le, 444 Mass. at 437-438
    , citing United States v. Owens, 
    484 U.S. 554
    ,
    561 (1988) (lack of "substantive content of a witness's answers
    does not mean that the defense has been deprived of the
    opportunity to confront").     But see Commonwealth v. Stewart,
    
    454 Mass. 527
    , 533 (2009) (reaffirming holding in Daye that
    total loss of memory preventing effective cross-examination may
    preclude admission of grand jury testimony at trial).
    Here, DaSilva was available for cross-examination at trial.
    Defense counsel was able to conduct, and did conduct, an
    effective cross-examination.    DaSilva recanted her grand jury
    testimony incriminating the defendants, and acknowledged some
    memory of the period in question.    She testified to using
    alcohol and drugs the weekend prior to the killing and to being
    brought food by the defendants that day.    She explicitly denied
    any memory of bad blood between Monteiro and the victim, any
    memory of seeing Monteiro at the hotel with a gun on the weekend
    prior to the shooting, and any memory of DePina wearing a gray
    sweatshirt on the day of the shooting.    Cf. 
    Daye, 393 Mass. at 71
    n.15 (cross-examination "could hardly hope to accomplish
    16
    more" than to convince witness to tell different, non-
    incriminating story [citation omitted]).
    iii.     Independently inadmissible portions of grand jury
    testimony.   Both defendants contend that even if the grand jury
    testimony was properly admitted, four specific portions should
    have been excluded.
    A.     "Totem pole" hearsay.   The defendants argue that two
    statements made by DaSilva's sister, Rodriguez, and introduced
    through DaSilva's grand jury testimony, should have been
    excluded as "totem pole" hearsay.    Totem pole hearsay is
    admissible only if each of the multiple hearsay statements falls
    within an exception to the hearsay rule.     See, e.g.,
    Commonwealth v. Gil, 
    393 Mass. 204
    , 218 (1984); Mass. G. Evid.
    § 805 (2016).   We agree that at least one statement ought not to
    have been admitted, but the error does not require a new trial.
    The first challenged statement -- DaSilva's testimony to
    the grand jury that Rodriguez said the defendants appeared
    nervous -- constituted hearsay not within any exception.        Before
    the grand jury, DaSilva testified that DePina and Monteiro acted
    nervously:   they "didn't want to go" back toward Johnson Court,
    they "were mad," and their reaction was "unusual."        She further
    testified, "My sister had noticed it, too, and said, 'Do they
    have something to do with it?'     Because my sister was like, 'oh,
    they're acting really nervous.'"    As neither defendant objected
    17
    to this particular statement at trial, we review only to
    determine whether its admission caused a substantial likelihood
    of a miscarriage of justice.   See, e.g., Commonwealth v.
    Stewart, 
    450 Mass. 25
    , 37 (2007).   Because the statement was
    cumulative of other, properly admitted evidence, namely
    DaSilva's own observations of the defendants' demeanor, we
    conclude that it did not.   See Commonwealth v. Spray, 
    467 Mass. 456
    , 471 (2014) (cumulative hearsay does not create substantial
    likelihood of miscarriage of justice); Commonwealth v. Britt,
    
    465 Mass. 87
    , 92 (2013) (no substantial likelihood of
    miscarriage of justice where "jury could have inferred" same
    fact from properly admitted evidence).
    In the second challenged statement, DaSilva related in her
    grand jury testimony, later admitted at trial, that Rodriguez
    asked DePina and Monteiro, "Well, if you didn't do it, what's
    the big deal?" and that neither responded.     DePina contends that
    this, too, is totem pole hearsay.   The judge allowed the
    question to come in as an adoptive admission by silence.
    Because Monteiro objected,9 we review to determine whether the
    error, if any, prejudiced the defendants.     See Commonwealth v.
    Martinez, 
    431 Mass. 168
    , 176 n.7 (2000).     An error is
    9
    Monteiro's objection put the judge on notice, and thus
    served the purpose of the requirement of a contemporaneous
    objection. Although DePina did not object at trial, we treat
    the issue as preserved for both defendants. See Commonwealth v.
    Charles, 
    57 Mass. App. Ct. 595
    , 598 n.7 (2003).
    18
    prejudicial if we "cannot find 'with fair assurance'" that it
    did not "substantially sway[]" the verdict (citation omitted).
    Commonwealth v. Canty, 
    466 Mass. 535
    , 545 (2013).
    Although the statement was not directed explicitly at
    either defendant, arguably one or both defendants might have
    been expected to deny what could have been perceived as an
    accusation.    In that event, the testimony properly could have
    been admitted as an adoptive admission.    See Commonwealth v.
    Olszewski, 
    416 Mass. 707
    , 719 (1993), cert. denied, 
    513 U.S. 835
    (1994).   We have cautioned, however, against the use of adoptive
    admissions by silence, because the lack of response may be due
    to "inattention or perplexity" rather than acknowledgment of
    guilt.    See Commonwealth v. Babbitt, 
    430 Mass. 700
    , 705 (2000).
    Assuming, for the sake of argument, that admission of
    Rodriguez's remark was error, we discern little, if any, impact
    on the verdicts.    The jury were presented with far more direct
    evidence of the defendants' guilt through Dossanto, as well as
    through DaSilva's own statements, and the prosecutor did not
    mention Rodriguez's statement in her closing argument.
    B.    Statements by nontestifying codefendant.   DePina
    challenges the admissibility of two statements he ascribes to
    Monteiro that were introduced as part of DaSilva's grand jury
    testimony.    Because there was no objection at trial, we review
    any errors to determine whether they give rise to a substantial
    19
    likelihood of a miscarriage of justice.     See Commonwealth v.
    Taylor, 
    455 Mass. 372
    , 381 (2009).    DaSilva testified that,
    before the killing, Monteiro said that he had been jumped by the
    victim and the victim's brother.     She also testified that, after
    the shooting, one of the defendants mentioned that he did not
    want to drive past Johnson Court because of a "beef" with people
    there.    DePina contends that these statements were hearsay and
    admitted improperly against him.
    The first statement as to Monteiro previously having been
    jumped by the victim, while relevant to Monteiro's motive and
    admissible against him, should not have been admitted against
    DePina.    A limiting instruction was neither requested nor given.
    Nonetheless, the error did not give rise to a substantial
    likelihood of a miscarriage of justice, as the improper
    testimony added little to the case against DePina.    DaSilva's
    testimony on this point was limited to one statement, and, in
    closing, the prosecutor mentioned DaSilva's statement in passing
    as a possible motive for the shooting, while focusing
    extensively on the "beef" between the north and south sides of
    Brockton.
    The second statement was admitted properly as a statement
    of a joint venturer.    A hearsay statement by one codefendant is
    admissible against another, absent testimony by the codefendant,
    if there is independent evidence of the existence of a joint
    20
    venture and the statement was made during and in furtherance of
    that joint venture.    See, e.g., Commonwealth v. Carriere, 
    470 Mass. 1
    , 8 (2014).    DePina concedes that, here, there was
    independent evidence of the joint venture.    Statements made to
    conceal a joint venture are considered to be in furtherance of
    the joint venture and, therefore, are admissible against all of
    the joint venturers.    See Commonwealth v. Angiulo, 
    415 Mass. 502
    , 519 (1993).     See also, e.g., Commonwealth v. Marrero, 
    436 Mass. 488
    , 494 (2002) (statements made "only a few hours after
    the crimes" and while defendants were together were part of
    joint venture).    On this record, a reasonable judge could have
    decided that the second statement, regarding a desire to avoid
    Johnson Court, reflected a fear of being caught near the scene
    of the crime, and thus was a continuing effort to conceal the
    joint venture.    There was no error in the admission of this
    statement.
    C.   Portions of grand jury testimony as to which DaSilva
    had not claimed lack of memory.    DePina argues that on at least
    one occasion, the prosecutor strayed, without specific
    objection, from the judge's instruction that grand jury
    testimony be introduced on a "question-by-question" basis, and
    that it only be admitted where DaSilva specifically denied
    memory of a topic.    DePina claims the failure to follow the
    judge's instruction created a substantial likelihood of a
    21
    miscarriage of justice by introducing evidence as to which
    DaSilva had not feigned memory loss.      See 
    Sineiro, 432 Mass. at 743-744
    .
    In fact, the prosecutor did follow the judge's question-by-
    question order.    DaSilva testified on direct examination that
    she could not remember whether anyone other than Monteiro was in
    her vehicle on the day of the shooting.      In response, the
    prosecutor introduced her statements to the grand jury
    discussing who had been in the vehicle, as well as what they
    were wearing, what they were discussing, and how they were
    acting.    The grand jury testimony that was admitted simply
    provided a complete answer to the question DaSilva was unwilling
    to answer on the stand; she could not have been expected to
    remember the clothing, conversations, and behavior of people
    whom she claimed not to remember at all.      There was no error.
    D.    Prior bad act evidence.    Monteiro filed a motion before
    trial to exclude references to his possession of a gun on the
    weekend before the shooting.10       He contends that the judge
    abused his discretion in denying the motion.
    Evidence of a defendant's possession of a gun may be
    admissible to show that he or she had the means to commit the
    10
    At that point, Monteiro expected the prosecutor to
    introduce evidence of gun possession through DaSilva's live
    testimony; it ultimately was introduced through her grand jury
    testimony.
    22
    offense.     See Commonwealth v. Corliss, 
    470 Mass. 443
    , 450
    (2015).     The Commonwealth generally may not introduce evidence
    of a gun, however, where the gun "definitively could not have
    been used in the commission of the crime."      Commonwealth v.
    Barbosa, 
    463 Mass. 116
    , 122 (2012) (excluding weapons of
    different caliber).     In this case, DaSilva testified before the
    grand jury that Monteiro had a handgun in his possession on the
    weekend before the shooting.     After some prompting, DaSilva
    agreed that it was a "gun that kind of looks like a policeman's
    gun."     This testimony was read at trial.   The ballistics
    evidence established that the cartridges found at the scene were
    from a .40 caliber handgun, and there was testimony that
    .40 caliber Glock handguns are common police weapons.      As the
    weapon DaSilva described could have been the weapon used in the
    shooting, there was no error in the admission of her testimony
    as evidence of means.11
    b.     Opening statement.   Both defendants argue that the
    prosecutor impermissibly referenced potentially inadmissible
    11
    Monteiro also argues that the gun DaSilva testified she
    saw at the hotel was black, although, during the shooting,
    another witness saw a brown gun. This argument misconstrues the
    trial testimony. No witness at trial identified the color of
    the weapon, although one witness testified that he saw "a brown
    hand with a gun in it." In any event, we have rejected the
    argument that testimony of gun possession is inadmissible where
    a witness testified that the gun used in the commission of the
    crime was a different color. See Commonwealth v. Otsuki, 
    411 Mass. 218
    , 235 n.12 (1991).
    23
    evidence in her opening statement, creating a substantial
    likelihood of a miscarriage of justice.    There was no error.
    The opening statement referred to DaSilva's anticipated
    testimony.    The defendants argue that because the prosecutor
    knew that DaSilva might recant her incriminating statements on
    the stand, and that, if she were to do so, the judge might rule
    against any subsequent motion to admit her grand jury testimony,
    the prosecutor should have avoided making any reference to
    testimony she planned to elicit from DaSilva.
    A prosecutor's opening statement may reference anything
    that he or she reasonably believes in good faith will be proved
    by evidence introduced during the course of the trial, even if
    he or she is not certain the necessary evidence will be
    admitted.    See, e.g., Commonwealth v. Fazio, 
    375 Mass. 451
    , 455-
    456 (1978) (opening statement previewed testimony from witness
    whom prosecutor knew to be asserting Fifth Amendment right).
    Specifically, the fact that an adverse evidentiary ruling might
    later bar introduction of certain evidence does not preclude a
    prosecutor from mentioning it in his or her opening.    See 
    id. at 456-457.
    Here, the prosecutor had a reasonable and good faith belief
    that she would produce the evidence that she set out in her
    opening statement.    While informed that DaSilva had claimed at
    the Martin hearing that her statements to the grand jury had
    24
    been false, and had suggested she would refuse to testify, the
    prosecutor learned from DaSilva's counsel, immediately before
    opening statements, that DaSilva did, in fact, intend to
    testify.12   The prosecutor then gave an opening statement that
    included the evidence she expected to introduce through DaSilva.
    The mere possibility that DaSilva might recant on the stand, and
    that the Commonwealth might not be permitted to introduce
    inconsistent grand jury if she did so, did not bar the
    prosecutor from previewing the testimony she anticipated.    See
    
    Fazio, 375 Mass. at 456
    .
    c.   Immunized witness testimony.   DePina maintains that the
    jury instructions concerning DaSilva's immunized testimony, to
    which there was no objection, were error that created a
    substantial likelihood of a miscarriage of justice.   We discern
    no error in the absence of the instructions DePina now requests.
    Although the judge did instruct the jury, in accordance
    with the model jury instructions, see Massachusetts Superior
    Court Criminal Practice Jury Instructions § 7.8, at 7-37 (Mass.
    Cont. Legal Educ. 2d ed. 2013), that they "may take [a grant of
    immunity] into consideration in assessing the witness's
    credibility," DePina contends that the judge also should have
    informed the jury explicitly that, by statute, they could not
    12
    Indeed, before receiving confirmation that DaSilva
    intended to testify, the prosecutor had prepared an alternative
    opening statement, omitting any mention of DaSilva.
    25
    find the defendants guilty solely on the basis of DaSilva's
    immunized testimony.    See G. L. c. 233, § 20I; Commonwealth v.
    Vacher, 
    469 Mass. 425
    , 440 (2014).
    We do not require any specific instructions regarding the
    testimony of an immunized witness, and we have rejected a
    requirement that a judge instruct explicitly that a conviction
    cannot be based solely on the testimony of such a witness.      See,
    e.g., Commonwealth v. Brousseau, 
    421 Mass. 647
    , 652-654 (1996).
    Rather, the focus is on whether the charge as a whole adequately
    explains the issue.    See 
    id. at 654.
       Here, the judge informed
    the jury that they could consider the effect of immunity on
    DaSilva's credibility, and counsel for both sides argued
    extensively in closing about the credibility of the immunized
    witness.   See 
    id., and cases
    cited (noting importance of
    counsels' argument on issue of credibility when evaluating
    adequacy of jury instructions).     The instructions were more than
    sufficient to inform the jury of the dangers of exclusive
    reliance on immunized witness testimony.
    d.     Denial of motion to sever.    Prior to trial, and again
    at the close of the Commonwealth's evidence, the defendants
    moved to sever the trials, arguing that the defenses would be
    mutually antagonistic, and that failure to sever would prevent
    them from receiving a fair trial.    Monteiro claims that the
    26
    judge abused his discretion by denying this motion.    We do not
    agree.
    A decision to sever a trial generally is left to the sound
    discretion of the trial judge.    See, e.g., Commonwealth v.
    McAffee, 
    430 Mass. 483
    , 485 (1999).    Severance on the ground of
    mutually antagonistic defenses is required only where "the
    acceptance of one party's defense will preclude the acquittal of
    the other."   See Commonwealth v. Ramos, 
    470 Mass. 740
    , 749
    (2015), quoting Commonwealth v. Moran, 
    387 Mass. 644
    , 657
    (1982).    It is not enough that a joint trial may cause a
    defendant to pursue a different strategy, or that a defendant
    would stand a better chance of acquittal if tried alone.     See
    McAfee, supra at 486.   Where some defenses overlap, while others
    are independent, a joint trial is appropriate.   See 
    Ramos, supra
    .
    We discern no abuse of discretion in the judge's decision
    not to sever the defendants' trials.    Each defendant sought to
    undermine the credibility of the Commonwealth's key witness,
    while also advancing his own separate grounds of defense.      See
    
    id. Here, as
    in 
    Ramos, supra
    , the defenses were, if anything,
    overlapping, and certainly not so mutually antagonistic as to
    require severance.13
    13
    On appeal, DePina argues that Monteiro's inculpatory
    statements were inadmissible against DePina, and were so
    27
    e.   Third-party culprit evidence.   Monteiro moved prior to
    trial to introduce various pieces of third-party culprit
    evidence.   The motion judge, who was also the trial judge,
    denied the motion in part, not allowing the introduction of
    evidence that the victim had been assaulted by an unknown
    assailant shortly before the shooting, and that the victim was
    planning to sell heroin to a particular individual on the day he
    was killed.   Monteiro argues that the partial denial was an
    abuse of discretion requiring a new trial.
    In order to be admissible, third-party culprit evidence
    "must have a rational tendency to prove the issue the defense
    raises, and the evidence cannot be too remote or speculative."
    Commonwealth v. Silva-Santiago, 
    453 Mass. 782
    , 801 (2009),
    quoting Commonwealth v. Rosa, 
    422 Mass. 18
    , 22 (1996).   Where
    the third-party culprit evidence is hearsay not within an
    exception, there must be "substantial connecting links" between
    prejudicial that their introduction required that he be tried
    separately. See Bruton v. United States, 
    391 U.S. 123
    , 126
    (1968). Evidence which does not expressly and directly
    implicate a defendant, however, does not implicate the Bruton
    rule. See Commonwealth v. Rivera, 
    464 Mass. 56
    , 69-70, cert.
    denied, 
    133 S. Ct. 2828
    (2013), and cases cited; Commonwealth v.
    Pontes, 
    402 Mass. 311
    , 314-315 (1988). Nor does evidence
    properly admitted under the joint venture exception to the
    hearsay rule. See Commonwealth v. Braley, 
    449 Mass. 316
    , 319
    (2007). See also Pontes, supra at 314, quoting Bruton, supra at
    128 n.3 (statements must be "clearly inadmissible" against
    codefendant). Because the statement concerning being jumped
    implicated DePina only by inference, and the statement about
    Johnson Court properly was admissible against him, neither gave
    rise to a Bruton error.
    28
    the evidence and the offense (citation omitted).   Silva-
    
    Santiago, supra
    .
    Monteiro sought to elicit hearsay testimony that, at some
    point shortly before the victim was killed, an unidentified
    attacker had thrown a brick at the victim, in order to suggest
    that others might have wished the victim harm.   The judge
    concluded that the evidence of an attack by an unknown
    assailant, at an unspecified time, was "not relevant."   We
    discern no error.   The proposed evidence lacked sufficient
    "connecting links" and would have served to confuse the jury.
    See 
    Silva-Santiago, 453 Mass. at 801
    .   See also Commonwealth v.
    O'Brien, 
    432 Mass. 578
    , 588-589 (2000) (evidence of hostility
    and fear between victim and alleged third-party culprit not
    admissible because it lacked sufficient connecting links).
    Monteiro also sought to elicit testimony from a man who
    purportedly planned to buy heroin from the victim on the day of
    his death.   Monteiro argued that evidence that the victim was a
    drug dealer suggested that people other than the defendants,
    such as rival drug dealers, might have had motive to kill him.
    The judge correctly concluded that such an inference, in the
    absence of any further evidence, amounted to no more than pure
    speculation.   See Silva-
    Santiago, supra
    .
    f.   Ballistics evidence.   Monteiro contends that testimony
    by the Commonwealth's ballistics expert caused a substantial
    29
    likelihood of a miscarriage of justice by improperly appealing
    to the jury's emotions and impermissibly suggesting that
    Monteiro was a person of bad character who had been involved in
    other shootings.   More specifically, the expert testified that,
    during the course of the investigation, he compared ballistics
    from the cartridges found at Johnson Court to those found at
    other crime scenes in Brockton.     The ballistics examiner noted
    these comparisons and testified that he had been unable to find
    any matches.
    Because a defendant may suggest to the jury that inadequate
    investigation led police to miss evidence which would have
    implicated others, or would exculpate the defendant, see
    Commonwealth v. Bowden, 
    379 Mass. 472
    , 485-486 (1980), the
    Commonwealth may present evidence to rebut such a contention,
    even if it otherwise would be inadmissible.     See, e.g.,
    Commonwealth v. Avila, 
    454 Mass. 744
    , 753 (2009).     In
    anticipation of such a defense, the Commonwealth elicited,
    without objection, a brief statement from an investigating
    officer of the result of ballistics tests.     There was no error.14
    g.   Fear of retaliation.     Monteiro argues that by eliciting
    testimony from Dossanto as to his fear of retaliation for
    14
    Even if the admission had been error, the testimony did
    not create a substantial likelihood of a miscarriage of justice.
    Contrary to Monteiro's suggestion, the expert's testimony did
    not appeal to the jury's emotions, nor did it imply that the
    defendants had been involved in other crimes.
    30
    cooperating with the Commonwealth, the prosecutor improperly
    vouched for his credibility, creating a substantial likelihood
    of a miscarriage of justice.
    Toward the end of the direct examination of Dossanto, the
    prosecutor asked him, without objection, why he had not come
    forward earlier and why he was not "honest" when police
    initially approached him.    This was not impermissible vouching.
    Vouching occurs when an attorney indicates his or her personal
    belief in the credibility of a witness, or indicates personal
    knowledge beyond the evidence.    See Commonwealth v. Rosario, 
    460 Mass. 181
    , 190 (2011).    "[T]estimony regarding a witness's fear
    of retaliation," on the other hand, "generally is admissible in
    the discretion of the [trial] judge, for the purpose of
    establishing witness credibility."    
    Id. at 193.
       See
    Commonwealth v. Auguste, 
    418 Mass. 643
    , 647 (1994), and cases
    cited.   Here, the prosecutor did not suggest any personal
    knowledge or reliance on facts not in evidence.      Rather, she
    allowed the witness to explain his earlier reticence, and his
    lack of initial honesty, in order to respond to an obvious
    avenue of attack on the witness's credibility by defense
    counsel.   See 
    Rosario, supra
    ; Auguste, supra at 647-648.
    h.     Relief pursuant to G. L. c. 278, § 33E.    We have
    carefully reviewed the entire record, pursuant to our duty under
    G. L. c. 278, § 33E.     We are satisfied that the verdicts were
    31
    not contrary to law, against the weight of the evidence, or
    otherwise unjust.   We therefore decline to exercise our
    authority under G. L. c. 278, § 33E, to set aside the verdicts
    or to reduce the degree of guilt.
    Judgments affirmed.