Commonwealth v. Seino ( 2018 )


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    SJC-10726
    COMMONWEALTH   vs.   CARLOS A. SEINO.
    Norfolk.    November 10, 2017. - May 8, 2018.
    Present:     Gants, C.J., Gaziano, Lowy, Budd, & Cypher, JJ.
    Homicide. Constitutional Law, Confrontation of witnesses,
    Assistance of counsel. Deoxyribonucleic Acid. Witness,
    Expert. Evidence, Expert opinion, Death certificate, Chalk
    drawing, Exculpatory. Practice, Criminal, Capital case,
    Confrontation of witnesses, New trial, Assistance of
    counsel.
    Indictments found and returned in the Superior Court
    Department on September 19, 2006.
    The cases were tried before Paul A. Chernoff, J.
    Brian J. Kelly for the defendant.
    Pamela Alford, Assistant District Attorney, for the
    Commonwealth.
    BUDD, J.     On the morning of August 3, 2002, the body of
    Daniel DeCosta was discovered on a walkway behind the public
    library in downtown Quincy.     The defendant, Carlos A. Seino, was
    indicted and ultimately convicted by a jury of murder in the
    2
    first degree on a theory of felony-murder and armed robbery in
    connection with DeCosta's death.     On appeal, the defendant
    claims that the trial judge committed reversible error by
    allowing the jury to be exposed to certain inadmissible hearsay
    and by allowing one of the substitute expert witnesses to
    testify to a match between the defendant's deoxyribonucleic acid
    (DNA) profile and one obtained from the victim's clothing.      In
    addition he seeks a new trial, claiming that his trial counsel
    was ineffective and that government officials committed
    misconduct in the course of investigating and prosecuting him.
    After full consideration of the trial record and the defendant's
    arguments, we affirm the defendant's convictions and decline to
    grant extraordinary relief pursuant to G. L. c. 278, § 33E.
    Background.   We summarize the facts the jury could have
    found, reserving certain details for discussion of specific
    issues.
    In the spring of 2002, the defendant moved into an
    apartment with two roommates in Quincy.    However, by August of
    that year, the defendant was "weeks and weeks late" on the rent.
    On August 2, the defendant's roommate warned the defendant that
    he would be asked to move out if he did not pay the total amount
    that he owed by the following day.    The defendant paid a portion
    of the amount due to his roommate that evening before going out.
    3
    In the meantime, the victim spent several hours that night
    at a local Quincy bar, where he cashed two checks for a total of
    $6031 and put the money in his jeans pocket.   At the bar, the
    victim drank several beers, played Keno2 and darts, and
    socialized.   He appeared to be drunk as he bought drinks for
    patrons and "flaunt[ed]" his money such that one of his friends
    urged him to "put [it] away."   He spent approximately eighty
    dollars while at the bar that night.
    The defendant arrived at the bar at approximately midnight.
    He saw some people he knew and observed the victim (whom he did
    not know) staggering around with Keno tickets.   The defendant
    stayed for between twenty and thirty minutes, leaving at
    approximately 12:30 A.M.   The victim left the bar when it
    closed, around 1 A.M., traveling by foot.
    At approximately 1:30 A.M., the defendant woke up his
    roommate and gave him the remaining money owed in cash.      Later
    that morning, the roommate observed the defendant in front of
    1 The bartender gave the victim one one hundred dollar bill,
    two fifty dollar bills, twenty twenty dollar bills, and three
    one dollar bills.
    2 Keno is a State lottery game in which a player wagers a
    bet, selecting up to twelve numbers from a field of eighty. The
    lottery randomly selects and displays on a monitor twenty
    numbers, and the player wins prize money if one or more of the
    player's numbers are displayed. 961 Code Mass. Regs. § 2.58
    (1998).
    4
    the television listening to the Quincy public access channel,
    which was broadcasting the police scanner.
    The victim's lifeless body was discovered at approximately
    7 A.M. on a walkway behind the Quincy public library with
    contusions to his nose and the back of his head.   Although his
    wallet was still on his person, most of the cash he had had was
    missing.   Investigators took samples from the defendant's
    clothing, including a snippet from the left front jeans pocket
    and a snippet from the front of the victim's shirt, both of
    which had bloodstains.   The DNA extracted from the jeans pocket
    sample was a mixture that matched the DNA profiles of both the
    victim and the defendant.   The DNA extracted from the bloodstain
    on the victim's shirt matched the profile of the defendant
    alone.
    The defendant, who testified at trial, offered weak alibi
    evidence to demonstrate that he did not have the opportunity to
    commit the crime.3   Further, he suggested the existence of a
    third-party culprit and speculated that blood from a cut on his
    hand ended up on the victim's clothing via incidental contact at
    the bar.
    3 The defendant testified that he visited several bars in
    succession after leaving the bar where the victim spent several
    hours. However, even taking the defendant at his word, he could
    have done all that he claimed and still committed the crime.
    5
    Discussion.     In his direct appeal, the defendant asserts
    violations of his constitutional right to confront witnesses
    with respect to testimony regarding portions of the victim's
    autopsy report and death certificate, DNA charts used as chalks,
    and evidence of matching DNA profiles offered through a
    substitute expert witness.    Following oral argument, the
    defendant filed a motion for a new trial with this court,
    alleging ineffective assistance of counsel and Brady violations,
    among other claims.    See G. L. c. 278, § 33E; Brady v. Maryland,
    
    373 U.S. 83
    , 87 (1963).    We examine each of the defendant's
    arguments in turn.
    1.   Autopsy and death certificate evidence.    During
    testimony by Dr. Richard Evans regarding the cause of the
    victim's death, the doctor, who did not perform the autopsy,
    referred to certain statements in the autopsy report and the
    death certificate -- documents that he did not author.       The
    defendant argues that it was a violation his right to confront
    witnesses to allow Evans to read in evidence what amounted to
    testimonial hearsay statements without the defendant having the
    ability to cross-examine the declarant, i.e., the medical
    examiner who created the documents.4    We agree.   However, we
    conclude that the error was harmless beyond a reasonable doubt.
    4 Hearsay is testimonial when a "reasonable person in [the
    declarant's] position would anticipate [it] would be used
    6
    As a general matter, a substitute medical examiner
    "may offer an opinion on the cause of death, based on his
    review of an autopsy report by the medical examiner who
    performed the autopsy and his review of the autopsy
    photographs, as these are documents upon which experts are
    accustomed to rely, and which are potentially independently
    admissible through appropriate witnesses."
    Commonwealth v. Reavis, 
    465 Mass. 875
    , 883 (2013).     Here, Evans
    reviewed the case folder of the medical examiner who performed
    the autopsy, which included the autopsy report, a toxicology
    report, handwritten notes and diagrams, and photographs.5    Beyond
    properly offering his opinion on the cause of death based on the
    case file and his examination, however, Evans went further,
    testifying as to statements contained in the autopsy report and
    the death certificate, namely, the length of the lacerations on
    the victim's head and the stated cause of death, respectively.
    The Sixth Amendment to the United States Constitution and
    art. 12 of the Massachusetts Declaration of Rights guarantee a
    criminal defendant's right to confront each of the government's
    witnesses.   See Melendez-Diaz v. Massachusetts, 
    557 U.S. 305
    ,
    309 (2009); Commonwealth v. Sanchez, 
    476 Mass. 725
    , 732 (2017).
    Thus, a judge at a criminal trial may not permit the
    introduction of testimonial hearsay without the defendant having
    against the accused in investigating and prosecuting a crime."
    See Commonwealth v. McCowen, 
    458 Mass. 461
    , 480 (2010).
    5 As the chief medical examiner, Evans endorsed the autopsy
    report at the time it was written. Moreover, he examined tissue
    from the victim's brain and memorialized his findings.
    7
    an opportunity to cross-examine the declarant.   See Melendez-
    Diaz, supra at 309, 311.
    Although Evans permissibly relied on the medical examiner's
    case folder to form his opinion as to the cause of the victim's
    death, it was error for him to testify to statements contained
    in that report and the death certificate, because the statements
    were testimonial hearsay and the person who created the
    documents was not available for cross-examination.   See
    Commonwealth v. McCowen, 
    458 Mass. 461
    , 480, 483 (2010).     See
    also Commonwealth v. Greineder, 
    464 Mass. 580
    , 592-593, cert.
    denied, 
    571 U.S. 865
    (2013); Commonwealth v. Avila, 
    454 Mass. 744
    , 763 (2009).
    Because the defendant objected to the statements contained
    in the autopsy report and death certificate at the time of
    trial, we review the constitutional error to determine whether
    it was harmless beyond a reasonable doubt.   Commonwealth v.
    Nardi, 
    452 Mass. 379
    , 394 (2008).
    Review under this standard requires us to consider, among
    other factors:
    "[1] the importance of the evidence in the prosecution's
    case; [2] the relationship between the evidence and the
    premise of the defense; [3] who introduced the issue at
    trial; [4] the frequency of the reference; [5] whether the
    erroneously admitted evidence was merely cumulative of
    properly admitted evidence; [6] the availability or effect
    of curative instructions; and [7] the weight or quantum of
    evidence of guilt."
    8
    Commonwealth v. Dagraca, 
    447 Mass. 546
    , 553 (2006).
    Here, the erroneously admitted statements from the death
    certificate and the autopsy report were of little, if any,
    consequence.   First, the improper testimony was cumulative of
    Evans's properly admitted opinion as to the cause of death.
    Evans opined as to the cause of death independently from what
    was on the death certificate.   See Commonwealth v. Scesny, 
    472 Mass. 185
    , 198 (2015); Commonwealth v. Emeny, 
    463 Mass. 138
    ,
    145-146 (2012).   Further, the statements regarding the length of
    the head lacerations had nothing to do with whether the
    defendant was the assailant:    they did not tend to incriminate
    the defendant, nor did they detract in any way from the
    defense's argument that he was not the assailant.     Finally,
    given the DNA evidence, discussed in more detail infra, together
    with the evidence of motive and opportunity, and taking
    everything into consideration, we conclude that the errors did
    not contribute to the guilty verdicts.   See Commonwealth v.
    Sinnott, 
    399 Mass. 863
    , 872 (1987).
    2.   DNA evidence.   At trial, the Commonwealth presented DNA
    evidence through three expert witnesses who gave opinions
    implicating the defendant in the killing.   The defendant
    challenges aspects of the testimony of all three.
    a.   Analysis of the evidence.    Red-brown stains found on
    the front left pocket of the victim's jeans and on the front of
    9
    the victim's shirt were determined to be bloodstains.   A snippet
    of each item was prepared for DNA analysis, and the resulting
    profiles were compared to the defendant's DNA profile when it
    was obtained in 2006.6
    The DNA profile from the bloodstain on the jeans pocket was
    developed at a Cellmark Diagnostics (Cellmark) laboratory in
    Maryland (Cellmark-Maryland).7   That laboratory's former
    director, Dr. Robin Cotton, testified that the DNA found on the
    jeans was a mixture of two profiles, that the victim was one
    potential contributor to the DNA sample, and that the second
    contributor was a man.8   When the defendant's DNA became
    available, an analyst from a Cellmark laboratory in Texas
    (Cellmark-Texas), Matthew DuPont, compared the profile from the
    jeans sample to the defendant's DNA profile and opined that the
    6 In 2006, the defendant pleaded guilty to a machete attack
    and was required to submit a sample of his deoxyribonucleic acid
    (DNA) for the Combined DNA Index System database.
    7 The State police crime laboratory has a contract with
    Cellmark Diagnostics (Cellmark), a private DNA-testing
    laboratory, under which Cellmark provides forensic DNA-testing
    services. Cellmark has several locations across the United
    States and contracts with a number of law enforcement agencies
    throughout the country. The DNA evidence in this case was
    processed and analyzed at the State police crime laboratory as
    well as in two different Cellmark laboratories.
    8 Cotton determined the second contributor was a man by
    subtracting the victim's profile and noting that the remaining
    DNA contained a Y-chromosome.
    10
    defendant was the second contributor.9   DuPont also testified to
    the statistical probability of such a match:   one in 17.34
    quadrillion of the African-American population, one in 1.854
    quintillion of the Caucasian population, one in 1.753
    quintillion of the Southwest Hispanic population, and one in
    2.475 quintillion of the Southeast Hispanic population.
    The sample from the victim's shirt was processed by the
    State police crime laboratory.   A representative from that
    laboratory, Laura Bryant, testified that the defendant's DNA
    profile matched the profile from the bloodstain on the victim's
    shirt.   Bryant also testified to the probability of a random
    match of the profiles of the DNA sampled from the victim's shirt
    and the defendant's DNA, concluding that the likelihood of a
    random, unrelated person having a DNA profile that matched the
    sample was about one in 1.79 quintillion of the Caucasian
    population, one in 16.74 quintillion of the African-American
    population, and one in 2.375 quintillion for the Hispanic
    population.
    9 Although Laura Bryant, an analyst from the State police
    crime laboratory, testified that the results from the pocket of
    the victim's jeans were inconclusive as to whether it matched
    the defendant's DNA profile when she performed the analysis, the
    two laboratories used different tests on the same material.
    DuPont tested for two additional genetic locations using an
    amplification tool different from that used in Bryant's
    laboratory.
    11
    b.   Confrontation issues.   The defendant asserts that the
    Commonwealth violated his right to confront witnesses when
    Cotton and Bryant presented charts and when DuPont testified as
    to a comparison between the defendant's DNA profile and the
    profile developed from the bloodstain on the victim's jeans.      We
    find no reversible error.
    i.   Contested chalks.   At trial, Cotton and Bryant, neither
    of whom conducted the DNA analysis, opined as to their own
    conclusions regarding the DNA testing on the samples taken from
    the victim's jeans and shirt respectively.   The defendant
    concedes that the opinion testimony of these two expert
    witnesses based on the work of others in their laboratories was
    admissible.   See, e.g., 
    McCowen, 458 Mass. at 483
    ; Commonwealth
    v. Barbosa, 
    457 Mass. 773
    , 786 (2010), cert. denied, 
    563 U.S. 990
    (2011).   However, the defendant claims error in the experts'
    use of charts that contained test results obtained by other,
    nontestifying analysts.
    Both Cotton and Bryant used charts as chalks to explain
    their conclusions to the jury.   The charts contained data
    generated by other analysts and showed the raw data generated by
    the DNA tests:   numbers or letters assigned to genetic locations
    12
    and "spikes" from an electropherogram.10   Cotton used two DNA
    charts, one for the jeans sample and one for the victim's
    profile.   Referring to the charts, Cotton showed the jury where
    the genetic locations from the jeans sample matched the genetic
    locations from the victim's profile.    In addition, Cotton used
    data from an electropherogram to demonstrate to the jury how she
    had concluded that a second man had contributed DNA to the jeans
    sample.    For her part, Bryant guided the jury through each step
    of the comparison, pointing out on the chart generated from the
    shirt bloodstain the numbers that matched those on the chart
    generated from the defendant's DNA.    In less detail, she also
    described to the jury the results of several comparisons,
    referring each time to tables from the report.
    Similar to our conclusion with respect to the testimony of
    Evans 
    discussed supra
    , it was improper for the Commonwealth to
    show the data the experts relied upon to the jury during direct
    examination without giving the defendant an opportunity to
    cross-examine those who obtained the results.    
    McCowen, 458 Mass. at 483
    .   Because the defendant did not preserve an
    objection to the use of the charts, we review the error for a
    10An electropherogram is a plot of results created when an
    analyst conducts an electrophoresis test. The plot resembles
    waves or peaks and allows analysts to visualize results.
    13
    substantial likelihood of a miscarriage of justice.11      See
    Commonwealth v. Carmona, 
    428 Mass. 268
    , 271 (1998).       Under the
    substantial likelihood of a miscarriage of justice standard, we
    affirm flawed convictions only where we are "substantially
    confident that, if the error had not been made, the jury verdict
    would have been the same."    Commonwealth v. Ruddock, 
    428 Mass. 288
    , 292 n.3 (1998).    See Commonwealth v. Montrond, 
    477 Mass. 127
    , 134 (2017).
    We conclude that there was no substantial likelihood of a
    miscarriage of justice because the charts did not taint the
    analysts' independent opinions, which, as 
    discussed supra
    , were
    properly admitted.     
    McCowen, 458 Mass. at 484
    .   The expert's
    opinions were what mattered to the jury, who likely would have
    found the raw data incomprehensible without the accompanying
    expert testimony.    
    Barbosa, 457 Mass. at 792
    .     The DNA charts
    merely displayed genetic locations, not any information
    regarding a match or the statistical probability thereof.
    11The defendant argues that this issue was preserved based
    on Commonwealth v. Grady, 
    474 Mass. 715
    , 719 (2016), in which
    this court held that a defendant need not "object to the
    admission of evidence at trial where he or she has already
    sought to preclude the very same evidence at the motion in
    limine stage." Grady has no retroactive application.
    Commonwealth v. Vazquez, 
    478 Mass. 443
    , 448 n.2 (2017). In any
    case, even if Grady were retroactive, it would not apply here,
    where the defendant opposed the Commonwealth's motion in limine
    to substitute expert witnesses, not the charts containing the
    DNA results. In fact, at trial the defendant objected only to
    the size of the charts, not their statistical contents.
    14
    Because the findings contained in the charts "had no meaningful
    probative value without [the] expert[s'] testimony, the
    erroneous admission of these underlying facts in evidence did
    not result in a substantial likelihood of a miscarriage of
    justice."   
    McCowen, supra
    .   See Commonwealth v. Kolenovic, 
    478 Mass. 189
    , 205-206 (2017); Barbosa, supra at 792-793.     See also
    Commonwealth v. Gonzalez, 
    469 Mass. 410
    , 416 (2014) ("the
    admission in evidence of those [charts] did not so materially
    strengthen the Commonwealth's case as to create a substantial
    likelihood of a miscarriage of justice").    The error does not
    require reversal.
    ii.     Contested testimony.   The defendant contends that it
    was reversible error to allow DuPont of Cellmark-Texas to
    testify that the defendant's DNA profile matched one of the
    profiles developed from the DNA found on the victim's jeans.
    Citing Commonwealth v. Tassone, 
    468 Mass. 391
    , 402 (2014), the
    defendant argues that allowing DuPont to do so violated the
    defendant's confrontation rights because an analyst from
    Cellmark-Maryland rather than Cellmark-Texas developed the DNA
    profile from the jeans.
    In Tassone, the Commonwealth presented an expert from the
    State police crime laboratory, who testified regarding a match
    between DNA from the defendant and DNA from the crime scene.
    
    Id. at 401.
      However, because a different laboratory did the
    15
    actual testing, and because the Commonwealth did not call an
    expert affiliated with that laboratory, we held that the
    defendant was "denied the opportunity to explore through cross-
    examination whether the opinion [was] flawed."     
    Id. at 402.
    That was not the case here.
    Here, the jury heard from, and the defendant had the
    opportunity to cross-examine, Kristen Sullivan, the analyst from
    the State police crime laboratory who developed the defendant's
    DNA profile from a known sample; Cotton, the supervisor from the
    laboratory (Cellmark-Maryland) that developed the DNA profile
    from the red-brown stain on the victim's left front jeans
    pocket; and DuPont, the analyst from Cellmark-Texas, who
    compared the two profiles, and whose opinions regarding the
    match and the statistical analysis were his own.     There was no
    error.12
    3.    Motion for a new trial.   Following oral argument on his
    direct appeal, the defendant filed a motion for a new trial,
    claiming, among other things, ineffective assistance of counsel
    and Brady violations.   See G. L. c. 278, § 33E.
    a.    Ineffective assistance of counsel.   The defendant
    claims that his counsel was ineffective for (1) failing to
    12The defendant's further argument that it was error for
    DuPont to have relied on Cotton's or Bryant's testimony is
    unavailing; as we 
    explained supra
    , the testimony from those
    experts was properly admitted.
    16
    object to the testimony of substitute witnesses, (2) waiving the
    presence of the defendant's DNA expert to observe the
    Commonwealth's DNA testing, (3) failing to call a pathologist or
    blood-spatter expert at trial, and (4) failing to challenge
    Combined DNA Index System (CODIS) evidence based on the general
    mishandling of DNA evidence at the State police crime
    laboratory.   The defendant also raises additional claims of
    ineffective assistance pursuant to Commonwealth v. Moffett, 
    383 Mass. 201
    , 208 (1981), namely, improperly stipulating to police
    diligence in the investigation; failing to investigate alibi
    witnesses in a timely way; and employing an investigator with a
    conflict of interest.
    Because the defendant was convicted of murder in the first
    degree, rather than evaluating claims of ineffective assistance
    under the traditional standard of Commonwealth v. Saferian, 
    366 Mass. 89
    , 96 (1974),13 we apply instead the more favorable
    standard of G. L. c. 278, § 33E, to determine whether there was
    a substantial likelihood of a miscarriage of justice.
    Commonwealth v. Wright, 
    411 Mass. 678
    , 681-682 (1992), S.C., 
    469 Mass. 447
    (2014).   See Commonwealth v. LaCava, 
    438 Mass. 708
    ,
    13Under Commonwealth v. Saferian, 
    366 Mass. 89
    , 96-97
    (1974), the standard is whether an attorney's performance fell
    measurably below that which might be expected from an ordinary
    fallible lawyer and, if so, whether such ineffectiveness has
    likely deprived the defendant of an otherwise available
    substantial defense.
    17
    712-713 (2003), quoting Commonwealth v. Harbin, 
    435 Mass. 654
    ,
    656 (2002).    That is, we determine whether defense counsel erred
    in the course of the trial and, if so, "whether that error was
    likely to have influenced the jury's conclusion."     Wright, supra
    at 682.   Under this standard, the defendant bears the burden of
    demonstrating both error and harm.    Commonwealth v. Barbosa, 
    477 Mass. 658
    , 674 (2017).    Here, the defendant has not met his
    burden.
    i.    Substitute witnesses.   As in his direct appeal, the
    defendant claims in his motion for a new trial that it was error
    for certain substitute witnesses to testify to factual findings
    appearing in exhibits, chalks, and reports.    In his motion for a
    new trial, he shifts the focus of the blame from the trial judge
    to his trial counsel, claiming ineffective assistance where
    counsel failed to object to the testimony of the substitute
    witnesses.    We reviewed this claim in part 2.b, supra,14 and
    found that any erroneously admitted evidence that came in by way
    of substitute witnesses without objection did not create a
    substantial likelihood of a miscarriage of justice.    See
    Commonwealth v. Holley, 
    476 Mass. 114
    , 121 (2016).
    14 As discussed in part 
    1, supra
    , trial counsel objected to
    the admission of statements contained in the autopsy report and
    death certificate. Although the evidence was admitted
    erroneously, we concluded that the error was harmless beyond a
    reasonable doubt.
    18
    ii.   Waiver of presence of defendant's expert during DNA
    testing.   The defendant also claims his trial counsel was
    ineffective for failing to send an expert to the State police
    crime laboratory15 to observe the DNA testing performed by the
    Commonwealth that consumed the entirety of (i.e., exhausted)
    particular samples.16   We need not decide whether trial counsel
    erred because the defendant has failed to show that he was
    harmed.    See, e.g., Commonwealth v. Hampton, 
    457 Mass. 152
    , 168
    (2010); Commonwealth v. Bradshaw, 
    385 Mass. 244
    , 274 (1982).
    First, we note that in fact trial counsel had selected an
    expert to attend the testing; however, that expert had passed
    away before the testing could be performed.   At the time that
    defense counsel waived the presence of a defense expert, the
    defendant had been in custody for over one year and had an
    expectation that the DNA testing would be beneficial to him.
    Further, the State police crime laboratory was experiencing
    delays.    Thus, trial counsel's waiver of a defense expert's
    presence at the testing was tactical, and not "manifestly
    unreasonable when made."    Commonwealth v. Field, 
    477 Mass. 553
    ,
    556 (2017).
    15As we 
    discussed supra
    , three different laboratories were
    involved in the DNA testing at issue in this matter: two
    Cellmark laboratories and the State police crime laboratory.
    16Prior to performing testing that exhausts a sample, the
    Commonwealth must request authorization from the defendant. See
    Commonwealth v. Williams, 
    455 Mass. 706
    , 710 (2010).
    19
    Second, only three out of a total of eight samples were
    exhausted during testing.17    Of those three samples, none matched
    the DNA profile of the defendant.18    The only sample tested at
    the State laboratory that matched the DNA profile of the
    defendant, the bloodstain from the victim's shirt 
    discussed supra
    , was not exhausted.     As the defendant has failed to
    demonstrate any prejudice as a result of not having his own
    expert present during the testing, there can be no substantial
    likelihood of a miscarriage of justice.     Cf. Commonwealth v.
    Alicea, 
    464 Mass. 837
    , 850-851 (2013).
    iii.   Failure to call particular expert witnesses.       In
    preparation for trial, defense counsel engaged both a
    pathologist and a blood spatter expert, both of whom assisted
    counsel in evaluating the Commonwealth's evidence and in
    preparing for cross-examination of the Commonwealth's experts.
    The defendant claims that his counsel's failure to call those
    experts to testify at trial constituted ineffective assistance.
    We disagree.
    The defendant asserts that the pathologist could have
    offered an alternative theory on cause of death, but he suggests
    17The three exhausted samples were a drop of blood from a
    railing and clippings from two of the victim's fingernails.
    18The DNA from the blood from the railing did not match the
    defendant's DNA. Neither of the fingernail clipping samples
    provided sufficient material to draw any conclusions.
    20
    no such alternative theory.   As for the blood spatter expert,
    the defendant claims that the expert could have explained that
    the defendant's blood on the victim's shirt was from the
    defendant's injured hand and was transferred there as the victim
    passed the defendant inside the bar.    The defendant fails to
    offer an expert affidavit, or anything else, to support this
    theory.    See Commonwealth v. Linton, 
    456 Mass. 534
    , 555-556
    (2010).    The defendant has failed, therefore, to meet his burden
    of showing ineffective assistance.19    See 
    Alicea, 464 Mass. at 850-851
    .
    iv.    Strategic choices regarding references to CODIS and
    the State police crime laboratory.     The defendant next claims
    that his counsel was ineffective for failing to attack the
    reliability of the Commonwealth's DNA evidence based on
    mismanagement at the State police crime laboratory.     We
    disagree.
    As we 
    explained supra
    , after the victim was killed, several
    years passed before the Commonwealth focused on the defendant as
    a suspect.    The Commonwealth compared the defendant's DNA
    profile to crime scene samples after his DNA sample became
    available in CODIS as a result of a conviction in an unrelated
    19We further note that, through cross-examination of the
    Commonwealth's experts, trial counsel undermined the
    Commonwealth's cause-of-death theory and elicited evidence to
    support the defense's theory of how the defendant's blood was
    transferred to the victim.
    21
    crime.   Defense counsel sought to exclude any reference to the
    defendant's DNA profile being in the CODIS database so that the
    jury would not learn that the defendant had a conviction in an
    unrelated matter, or speculate about why the defendant's DNA had
    been entered into the database.     For its part, the Commonwealth
    was concerned that if the jury did not know the circumstances in
    which the police came to focus on the defendant, they might
    conclude that the Commonwealth had been unduly slow or
    inattentive during the investigation.     Ultimately, the parties
    compromised:     the Commonwealth would not reference CODIS, and
    the defendant would stipulate to police diligence in the
    investigation.
    Because trial counsel determined that it would be in the
    defendant's best interest for the jury not to hear about CODIS,
    this necessarily meant that she would not be able to elicit
    evidence regarding the alleged mismanagement of CODIS
    administration at the State police crime laboratory.     This was a
    reasonable strategic choice, and was therefore not ineffective
    assistance of counsel.     See 
    Field, 477 Mass. at 556-557
    (2017).
    See also Commonwealth v. Morgan, 
    453 Mass. 54
    , 60 (2009).
    v.   Moffett claims.     The defendant also argues that his
    trial counsel was ineffective for stipulating to the diligence
    of the police in their investigation; for failing to investigate
    the defendant's alibi witnesses in a timely way; and for using a
    22
    private investigator who had an alleged conflict of interest.
    None of these claims has merit.
    First, the defendant asserts that he disagrees now with the
    stipulation regarding diligent police work because the
    prosecution and the police withheld exculpatory information from
    the defense.    This argument is misplaced.   As 
    discussed supra
    ,
    trial counsel stipulated that law enforcement acted diligently
    over the four-year period between the death of the victim and
    the arrest of the defendant so that the jury would not learn
    that the defendant had been convicted of an unrelated crime.20
    This stipulation had nothing to do with the mishandling of
    allegedly exculpatory evidence (discussed further infra).
    Second, although the defendant claims that his trial
    counsel failed to seek out alibi witnesses in a timely way, his
    trial counsel disputes having been given a list of potential
    witnesses.     At any rate, as 
    discussed supra
    , the defendant
    testified to his own movements that night, and the Commonwealth
    aptly pointed out that it was possible for the defendant to have
    done everything he claimed to have done and yet still have had
    the opportunity to kill the victim.    As the defendant does not
    say who his alibi witnesses would have been or how their
    testimony would have been exculpatory given his own testimony,
    20We note that trial counsel's stipulation came before the
    defendant could have learned of any alleged withheld or
    destroyed evidence.
    23
    he has not shown that their absence prejudiced him.     Cf. 
    Morgan, 453 Mass. at 61
    (failure to "show how [a witness] could have
    aided" defendant's case fatal to defendant's claim of
    ineffective assistance for failure to call witnesses).
    Third, the defendant claims that his counsel was
    ineffective for hiring an investigator who was a former Quincy
    police officer.   According to defense counsel's affidavit, the
    investigator was never employed by Quincy police in any
    capacity, and the defendant has failed to prove otherwise.    See
    Commonwealth v. Comita, 
    441 Mass. 86
    , 93 (2004).21
    b.   Alleged Brady violations.   The Commonwealth must
    disclose to the defense any material, exculpatory evidence over
    which the prosecution has control.    Commonwealth v. Sullivan,
    
    478 Mass. 369
    , 380 (2017).   See 
    Brady, 373 U.S. at 87
    .    This
    duty extends to evidence "in the possession of the police who
    participated in the investigation and presentation of the case."
    Commonwealth v. Tucceri, 
    412 Mass. 401
    , 407 (1992).
    The defendant claims that the Commonwealth violated his due
    process rights by failing to preserve investigator notes and by
    21Even accepting the defendant's allegation as true, there
    would be no conflict of interest. See Commonwealth v. Stote,
    
    456 Mass. 213
    , 218 (2010), quoting Commonwealth v. Shraiar, 
    397 Mass. 16
    , 20 (1986) ("It is the defendant's burden to prove an
    actual conflict of interest by presenting 'demonstrative proof
    detailing both the existence and the precise character of this
    alleged conflict of interest; we will not infer a conflict based
    on mere conjecture or speculation'").
    24
    failing to disclose a photograph of his injured hand.        Where the
    defendant claims that the Commonwealth lost or destroyed
    evidence, he bears the initial burden of showing "a reasonable
    possibility, based on concrete evidence," that the evidence was
    exculpatory.22     Commonwealth v. Williams, 
    455 Mass. 706
    , 718
    (2010), quoting Commonwealth v. Willie, 
    400 Mass. 427
    , 433
    (1984).   Here, he has failed to meet that burden.    See Williams,
    supra; Commonwealth v. Cintron, 
    438 Mass. 779
    , 784-785 (2003).
    i.   Notes.    A State police sergeant destroyed his
    handwritten notes of an interview with the defendant after
    preparing his police report.23     Although the defendant was
    necessarily aware of what took place during his interview, and
    was provided with a copy of the police report, he claims that he
    was deprived of the ability to mount a defense without the
    underlying notes.     The defendant has not made any showing,
    however, as to how the notes would have differed from the report
    or otherwise would have been exculpatory.     Further, the
    defendant had a full opportunity to cross-examine the sergeant
    22The defendant has not established that the police
    destroyed the notes or photograph "in bad faith or recklessly."
    Commonwealth v. Sanford, 
    460 Mass. 441
    , 450 (2011), quoting
    
    Williams, 455 Mass. at 718
    . The defendant cannot, therefore,
    take advantage of the analysis more favorable to the defendant
    for such cases, which would require the Commonwealth to show
    that "the lost or destroyed evidence was not potentially
    exculpatory." See 
    Sanford, supra
    .
    23The trooper destroyed the notes in the ordinary course of
    business and well before the defendant became a suspect.
    25
    about the notes, the report, and any potential discrepancies
    between the two.    The defendant has failed to carry his burden.
    See Commonwealth v. Kater, 
    432 Mass. 404
    , 420-421 (2000).
    ii.    Photograph.    As for the alleged photograph of the
    defendant's injured hand, the defendant has failed to
    demonstrate that such a photograph existed or that it would have
    been exculpatory.    See 
    Comita, 441 Mass. at 93
    , quoting
    Commonwealth v. Bernier, 
    359 Mass. 13
    , 15 (1971) (in motion for
    new trial, defendant bears burden of proving "facts that are
    'neither agreed upon nor apparent on the face of the record'").
    At trial, the defendant testified that the police required
    him to "peel [his bandage] back so they could take a photograph"
    of his injured hand.     However, the prosecutor did not have such
    a photograph and stated that he was unaware of one.     The
    defendant alleges now that the Commonwealth has either withheld
    or destroyed the photograph.
    The defendant has made no showing, however, of what a
    photograph of his injured hand would have added to his case.
    The Commonwealth never disputed that the defendant's hand was
    injured:   indeed, two witnesses testified to observing the hand
    injury.    The defendant has thus failed to show that such a
    photograph, even assuming it existed, would have been
    exculpatory.   See Commonwealth v. Laguer, 
    448 Mass. 585
    , 595,
    598 (2007).
    26
    c.   Remaining Moffett claims.     Finally, the defendant's
    remaining Moffett claims are without merit.     There is no basis
    in the evidence that the police altered the crime scene or moved
    the victim's body as the defendant claims.    See Commonwealth v.
    Gentile, 
    437 Mass. 569
    , 581 (2002).    Nor is there evidence,
    beyond the defendant's bald assertion, that pictures of the
    crime scene were inaccurate due to renovations.    Finally, the
    defendant has presented no evidence of illegal surveillance
    while he was detained in the Norfolk County house of correction,
    or that any such illegal surveillance was relied upon at trial.
    See 
    Comita, 441 Mass. at 93
    .
    4.   Review under G. L. c. 278, § 33E.     We have reviewed the
    briefs and the entire record and discern no reason to reduce the
    degree of guilt or grant a new trial pursuant to our power under
    G. L. c. 278, § 33E.
    Judgments affirmed.
    Motion for a new trial
    denied.