On Jаnuary 20, 2000, the victim received a package containing a pipe bomb, which exploded when she opened it, blowing her body asunder and killing her instantly. A jury in the Superior Court found the defendant, Steven Caruso, guilty of murder in the first degree on theories of deliberate premeditation and extreme atrocity and cruelty.
The defendant appeals from his conviction, claiming that (1) the admission of testimony by a jailhouse informant violated the defendant’s confrontation rights; (2) a ballistics expert improperly testified to a report prepared by an unavailable expert; (3) the testimony of the Commonwealth’s wire expert should have been excluded; (4) the Commonwealth failed to establish adequately the reliability of computer forensics evidence; and (5) the admission of the victim’s prior recorded testimony and limitations on the defendant’s ability to attack its veracity violated the defendant’s confrontation rights. We conclude that no reversible error occurred, and we affirm the jury’s verdict.
Background. We recite the faсts the jury could have reasonably found in the light most favorable to the Commonwealth, reserving certain details for our analysis of the issues.
The defendant was closely connected with many events taking place at the restaurant and with many of the people who worked there. The defendant, a handyman by trade, did repair work at the restaurant and in the homes of its employees. He also attended some social events organized for employees of the restaurant.
Eventually, the relationship between the defendant and the victim took a negative turn. The defendant asked the victim on a date. The victim declined, and the defendant’s demeanor changed. Although the defendant had a reputation among the restaurant’s staff for staring at people, he began to stare exclusively at the victim and in a hateful manner.
Tension between the defendant and the victim escalated. On two occasions, the defendant poured battery acid into the gasoline tank of the victim’s motor vehicle, for which the defendant was convicted of destroying the victim’s property. He was sentenced to eighteen months in a house of correction, with six months to serve and the balance suspended for two years. He also was ordered to make monthly restitution payments. A payment was due in January, 2000. The defendant also was charged with, but not convicted of, slashing the victim’s tires.
In addition, the victim had obtained a restraining order against the defendant after the first battery acid incident. After the second battery acid incident, the victim returned to court regarding the restraining order violation. At the end of the ensuing proceeding, the judge told the defendant the restraining order was still in full effect. Nevertheless, immediately after the hearing, the defendant approached the victim, coming within about two feet of her in a nearby parking lot. A few months later, the defendant drove by the restaurant again.
2. Victim’s death. On the afternoon of Thursday, January 20, 2000, at approximately 12:30 p.m., the victim was instantly killed in her apartment when she opened a package containing a pipe bomb. The victim lived on the second level of an owner-occupied home in Everett.
The homeowner and her husbаnd responded with speed. They went to the second-floor apartment and opened the door. They saw smoke, smelled an odor, and saw the victim’s body on the floor. They telephoned 911.
Police arrived at the scene promptly. A responding officer identified the odor as similar to gunpowder. From the doorway to the apartment, the officer saw human tissue and blood spatter on the wall, floors, and ceiling. He called to the victim, whose body he saw at the end of a hallway. There was no response. The cause of death was later determined to be massive blast injuries.
Based on the defendant’s troubled history with the victim, the police promptly sought to question him that same day. The defendant provided police with two inconsistent descriptions of his whereabouts earlier that morning. First, he told the police that he had gone from his home to a library around 10 a.m., then to a café. Later, he told the police that he had gone to the café first, followed by the library.
Later that same evening, the poliсe returned to the defendant’s home to secure it, pending the issuance of a warrant, which was subsequently executed. Again, the defendant voluntarily answered the questions police asked. He knew that the police were there “about that girl that got blown up in Everett,” who had “caused [the defendant] a lot of problems.” He also stated that he did not like the victim anymore. When asked what he thought should happen to a person who committed such a crime, the defendant responded, “Well, you don’t know all the facts.”
3.
Search of crime scene and defendant’s home.
From the crime scene, police recovered, among other things, battery parts, pieces
In executing the warrant at the defendant’s home, the police discovered a number of items that were introduced as evidencе at trial. The police found drill bits, an electronics wiring tool kit, batteries, copper wire, pieces of pipe, and ammunition. The wire, pipe fragments, batteries, and gunpowder obtained at the defendant’s home were consistent with similar materials found at the scene of the explosion.
In the defendant’s bedroom, police recovered various documents containing detailed information about the victim, her family, and past boy friends, including documents with the victim’s date of birth, Social Security number, home address, and place of employment. Police also recovered correspondence between a former boy friend and the victim, and a document containing a postal service code referring to the mail route to the victim’s home. Shortly after the search, the defendant’s sister informed police that she had discovered a booklet entitled, “High-Low Boom Explosives,” in the defendant’s room.
During a forensic investigation of the defendant’s computer, police discovered information related to the victim and her family that had been accessed by the defendant in the days leading up to her death, including that the defendant had used an astrology program and a family tree program containing the victim’s personal information, such as her telephone number and former addresses. Through the family tree program, the police accessed a mailing label containing the name “Sebastiano Passanisi,” the victim’s brother-in-law, with a Malden address, consistent with the return address on the package containing the bomb. Neither the victim’s sister nor her brother-in-law had lived in Malden for approximately thirty years. Police found no information related to any other family in the program.
Discussion.
1.
Testimony ofjailhouse informant.
Following his arrest, the defendant encountered Michael A. Dubis, another prisoner, in a holding cell at a hospital.
2
Dubis recognized the defendant’s name and face from the newspaper and asked him
The defendant made numerous incriminating statements to Dubis. The defendant told Dubis that he had learned about making bombs from a friend, that he had used batteries and a pipe, and that the package would only explode when it was opened due to a “basic separation device.” The defendant also said that he “got [the bomb] there,” that he used the return address of the victim’s sister on the package, and that he knew the bomb would kill anyone who opened it. In addition, the defendant described his relationship with the victim, including the incidents involving damage to the victim’s vehicle and that the victim had a video recording of him “messing with” her vehicle. The defendant said that the victim would not go out with him and that he was mad at her and called the victim a “bitch.”
Dubis relayed this information to a State trooper, Sergeant James Plath, to whom Dubis had previously provided information. Plath informed law enforcement officials involved in the defendant’s case. Following a motion to suppress, which was denied, Dubis testified to the defendant’s statements at trial.
The defendant argues that the motion judge, who also was the trial judge, erred in denying the motion to suppress his statements to Dubis, and therefore Dubis’s testimony was improperly admitted at trial; the defendant also argues that the judge erred at trial by allowing the Commonwealth to use prior consistent statements to rehabilitate Dubis after cross-examination. We reject each argument.
a. Motion to suppress informant’s testimony. In his pretrial motion to suppress Dubis’s testimony, the defendant argued that Dubis was a government agent who questioned the defendant in violation of his right to counsel — which had attached at his arraignment — in violation of the Sixth Amendment to the United States Constitution and art. 12 of the Massachusetts Declaration of Rights.
“The court accepts the findings of fact from a suppression hearing absent clear error,” but independently applies constitutional principles to determine whether an informant was a government agent.
Commonwealth
v.
Murphy,
In a written decision, the judge made the following findings related to Dubis’s previous involvement as a government informant. Dubis first acted as a government informant in 1988, while serving a sentence in a house of correction. He also testified for the Commonwealth in two murder trials. See
Commonwealth
v.
Tevlin,
The judge also found that no one, including Plath, promised Dubis any assistance in return for information he provided. Between his 1998 sentencing and his testimony at the motion to supprеss hearing in 2003, Dubis sought parole three times. Dubis was denied parole on each occasion, and no law enforcement official spoke on his behalf at any parole hearing.
The Sixth Amendment and art. 12
3
prohibit the Commonwealth from “deliberately eliciting]” incriminating statements from an individual who has been charged with a crime, without the individual’s counsel present.
Tevlin,
“The United States Supreme Court has not clearly defined the point at which agency arises.”
Murphy,
No agency relationship exists in the absence of a prior arrangement between the Commonwealth and the informant. For example, no agency relationship forms when the Commonwealth does not promise a benefit to an informant, even where — as in this case — the informant has provided information to a particular police officer on multiple prior occasions.
Harmon,
Based on the facts established at the motion to suppress hearing, Dubis was not an agent of the Commonwealth. No evidence suggests that the Commonwealth put the defendant and Dubis in the same cell in order to elicit information from the defendant. Nor does the evidence show that any law enforcement official involved in the defendant’s case knew that Dubis and the defendant would be placed in the same cell or that their encounter was the result of anything but happenstance. That Dubis had provided information to a particular officer on more than one occasion does not demonstrate that he was a government agent.
Harmon,
Dubis’s conduct as an informant is also unlike the informants in
Murphy,
The judge properly denied the defendant’s motion to suppress. The record does not show that the Commonwealth engaged in any conduct in contravention of its “affirmative obligation not to act in a manner that circumvents and thereby dilutes the protection afforded by the right to counsel.”
Murphy,
b. Rehabilitation of informant through prior consistent statements. The defendant also claims that it was error to permit the Commonwealth to rehabilitate Dubis at trial using prior consistent statements, where the trial judge failed to make an explicit finding that Dubis had made the prior consistent statements before his motive to fabricate arose. We disagree.
Prior consistent statements are generally inadmissible. Mass. G. Evid. § 613(b)(1) (2016). However, an exception exists where a trial judge makes a preliminary finding (1) that the witness’s in-court testimony is claimed to be the result of a recent fabricаtion or contrivance, improper influence or motive, or bias; and (2) that the prior consistent statement was made before the witness had a motive to fabricate, before the improper influence or motive arose, or before the occurrence of the event indicating a bias.
Commonwealth
v.
Kater,
During the defendant’s cross-examination of Dubis, defense counsel used prior inconsistent statements from Dubis’s testimony at the motion to suppress hearing. Defense counsel elicited that, until the week of the trial, Dubis had not seen the report generated by his initial interview with police regarding the defendant. Defense counsel also suggested that Dubis was expecting assistance at upcoming parole hearings and that Dubis intended to ask the prosecution in this case to assist him with obtaining release from prison early and being placed on a bracelet. Defense counsel then asked Dubis, ‘“So all of a sudden you were shown what they want you to say, isn’t that right?” This question suggested a recent contrivance, improper influence, or bias, and the trial judge permitted the Commonwealth to rehabilitate Dubis using his initial statement.
The defendant argues that the rehabilitation was improper because Dubis had the same motive to fabricate (i.e., to ingratiate himself with law enforcement) at the time he made his prior statement. Although that may be true, defense counsel indicated a particular event influenced Dubis’s testimony by alleging the Commonwealth showеd Dubis ‘“what they want[ed] [him] to say” in the week leading up to trial. The Commonwealth was entitled to rebut that suggestion. See
Rivera,
The record shows that Dubis’s prior consistent statements predated the time at which the defendant implied the Commonwealth told Dubis what to say. Dubis made his original statements to the police on June 29, 2000. Dubis did not testify until July 31, 2003. The prior consistent statements were admissible to corroborate Dubis’s testimony, and the trial judge provided a limiting instruction during the final charge.
2.
Propriety of substitute testimony for unavailable witness.
At trial, State police Trooper Michael R. Arnold testified in place of Captain John Busa, who was unavailable due to illness, regarding
Criminal defendants in Massachusetts must have a “meaningful opportunity” to cross-examine an expert regarding his or her opinion.
Commonwealth
v.
Tassone,
3. Expert testimony concerning electrical wire. Based on items seized from the defendant’s home, the Commonwealth sought the expertise of Dennis Toto. Toto was a licensed electrician, an electrical consultant to the State fire marshal, and formerly the chief wire inspectоr in Revere. He conferred with a State police chemist, who showed him wire with white insulation and a red stripe, retrieved from the crime scene, and asked for Toto’s assistance to locate similar wire.
At trial, Toto testified to three primary opinions on direct exantination: (1) the wire he examined from the crime scene was not fit for use in household wiring; (2) the wire recovered from the crime scene would not have come from a coffee maker that was destroyed in the explosion; and (3) he located wire that appeared to be “the exact same” or “extremely similar” at a small electronics store, which he subsequently sent to the chemist.
9
The
“The trial judge has a significant function to carry out in deciding on the admissibility of a scientific expert’s opinion.”
Commonwealth
v.
Lanigan,
For the first time on appeal, the defendant argues that the methodology underlying Toto’s opinions was unreliable. In order to preserve an objection to an expert’s methodology, a defendant must file a pretrial motion stating the grounds for its objection.
Commonwealth
v.
Sparks,
Even if we were able to discern that Toto’s methodology was not sufficiently reliable, his testimony created no substantial likelihood of a miscarriage of justice. First, Toto adequately explained physical differences between household and appliance wiring to the jury.
Commonwealth
v.
Pytou Heang,
4. Evidence derived from searches of defendant’s computer. Detective Lieutenant John McLean of the Medford police department conducted two searches of the defendant’s computer. As a result, the Commonwealth introduced two types of evidence, the admission of which the defendant argues constitutes reversible error: (1) dates upon which certain files on the computer were last accessed; and (2) still images of files displayed on the computer monitor (screen shots). No reversible error occurred.
a. Last access dates. McLean testified to a number of dates on which filеs on the defendant’s computer were accessed and on which electronic mail messages were transmitted. In particular, the defendant objects to the introduction of the last access date of an astrology program on the defendant’s computer. When McLean launched the program, it contained the victim’s horoscope information. McLean testified that the information was last accessed on January 19, 2000 — the day before the victim’s death. McLean did not enter the victim’s name into the program, nor did his investigation alter the access date. The Commonwealth invoked this access date in its closing argument to suggest that the defendant was obsessed with the victim.
The defendant argues the last access dates should not have been admitted in evidence because the Commonwealth did not establish the accuracy or reliability of the computer’s time-keeping function. There was no error.
Jurors may rely on their own common sense and life experience in their role as fact finders. Even in the year 2000, people commonly and reasonably relied on the accuracy of time-keeping mechanisms on computers, cellular telephones, and other electronic devices. Evidence that a time stamp indicates a particular time is a sufficient basis for a jury to conclude that the relevant activity took place at that time, particularly when there is no evidence to the contrary in the record. 10
b.
Screen shots.
McLean testified regarding a number of screen shots taken from the defendant’s computer. The defendant objects
When McLean opened the astrology program, the default screen showed the victim’s name at the top. McLean did not enter the victim’s name. He explained that the default screen was determined by data and settings for the program contained in other files on the computer. Without entering any other information, McLean scrolled down through the menu choices that the program displayed, which showed the victim’s name, birth horoscope, birth date, time of birth, and birth location. McLean then chose “select” on the victim’s name, causing the program to display additional information.
McLean similarly explained that the family tree program referenced data contained in other files in the computer, including files labeled using the victim’s last name. When McLean opened the family tree program, it defaulted to the victim’s information based on the computer’s existing settings. The Commonwealth introduced several screen shots from the program that displayed only when McLean himself made certain selections within the program. McLean could not determine whether the defendant had made the same selections.
The defendant objects to the admission of the screen shots that only displayed following McLean’s selections in each of the programs. The defendant argues the screen shots were inadmissible because the Commonwealth failed to demonstrate (1) the reliability of the software; and (2) that the defendant used the software in the manner represented by the Commonwealth.
No reversible error occurred. We reject the defendant’s first argument and partially reject the second. McLean’s testimony sufficiently demonstrated how the software worked. However, all but one of the screen shots were inadmissible because the Commonwealth could not demonstrate that the defendant actually accessed the same information. One screen shot — the only one directly inculpating the defendant — was properly admitted. The remainder were either cumulative or innocuous and did not prejudice the defendant.
The Commonwealth established the reliability of the programs. See
Commonwealth
v.
Torres,
The erroneously admitted screen shots did not prejudice the defendant. In
Commonwealth
v.
Williams,
However, most of the improperly admitted screen shots contained only general information regarding the victim and her family that was cumulative of much more compelling evidence from a multiplicity of sources that the defendant was obsessed with the victim. Given the wealth of other admissible evidence on that point, the screen shots admitted in error were cumulative. See
Commonwealth
v.
Esteves,
The only screen shot that was properly admitted depicted a mailing label from the family tree program. The label contained the name “Sebastiano Passanisi” and a Malden address. The victim’s downstairs neighbor testified that the mailing label on the package contained the name “Lois Passanisi” (Sebastiano’s wife and the victim’s sister) with a Malden address. Lois Passanisi had not lived in Malden in the roughly thirty years prior to the victim’s death. Even when she did live in Malden, her last name was not Passanisi, and the home where she resided was not in her name. Nor had Sebastiano Passanisi lived in Malden at any point in the preceding thirty years. The defendant also told Dubis that he had used the address of the victim’s sister as the return address on the package. Even though McLean could not testify that the defendant had seen the mailing label, the jury reasonably could have inferred that the source of the inaccurate information on the package containing the bomb was the family tree program on the defendant’s computer. Cf.
Williams,
5.
Use of victim ’s testimony from prior proceedings.
At trial, the Commonwealth introduced in evidence transcripts of the
In her testimony from each proceeding, the victim identified the defendant as an individual committing certain prior bad acts, which were admissible “to show motive . . . and to show the entire relationship between the defendant and the victim” (citations omitted).
Commonwealth
v.
Drew,
The defendant makes two arguments related to the admission of the transcripts. First, the victim’s testimony from the hearings was not admissible because it does not fall within the prior recorded testimony exception to the rule against hearsay and its introduction violated his confrontation rights under the Sixth Amendment and art. 12. The defendant did not object at trial to the transcripts based on the limits of the prior recorded testimony exception or constitutional grounds. We review any error to determine whether it created a substantial likelihood of a miscarriage of justice. See
Commonwealth
v.
Cintron,
Second, the defendant argues that the trial judge improperly restricted his ability to impeach the victim’s prior testimony using
a.
Admissibility of victim’s prior testimony.
“We need not decide the admissibility of [the victim’s] testimony as prior recorded testimony under our common law rule. If the standards of the confrontation clause are met in the admission of [the victim’s] testimony, the interests of justice test applied under G. L. c. 278, § 33E, is also met.”
Commonwealth
v.
Trigones,
Admitting prior testimony does not violate the defendant’s confrontation rights when the declarant is unavailable, as a matter of law, to testify and “the defendant has had an adequate prior opportunity to cross-examine the declarant.”
Commonwealth
v.
Hurley,
The prior proceeding need not be addressed to precisely the same issue, and the defendant need not have had precisely the
We previously have considered whether a defendant had a sufficiently similar motive on cross-examination in a prior proceeding for purposes of the confrontation clause, when the prior proceeding arose from the same underlying conduct. For example, a declarant’s prior testimony from a pretrial dangerousness hearing pursuant to G. L. c. 276, § 58A, may be sufficiently similar when introduced at a subsequent trial of criminal charges for the same conduct.
Hurley,
In
Commonwealth
v.
Canon,
In this case, the issues and the defendant’s motive on cross-exantination at the prior proceedings were sufficiently similar to satisfy the confrontation clause. See
Hurley,
The prior recorded testimony was admitted at trial only to prove the bad act, as relevant to the hostile relationship, rather than the conduct forming the basis of the murder charges. The issues at the prior proceedings and at the murder trial were therefore sufficiently similar to permit the jury to determine the credibility of the victim’s testimony from those earlier proceedings,
Hurley,
b. Restriction on use of video recordings to impeach victim’s prior testimony. At trial, the defendant moved to introduce two video recordings, created by the victim, that purportedly showed the defendant pouring battery acid into the gasoline tank of her vehicle. Originally, the Commonwealth sought to introduce the recordings, but the defendant objected on the grounds that they were “dark and murky” such that the “person’s face is unable to be seen.” The trial judge excluded the recordings.
Subsequently, the defense sought to admit thе recordings for two purposes: (1) to impeach the victim’s prior recorded testimony in which she identified the defendant, and (2) to demonstrate in the defense’s case that the defendant was not the individual captured in the recordings. On appeal, the defendant argues only that the trial judge erred with respect to the first purpose. 16 The trial judge did not err in denying the defendant’s motion.
A trial judge has discretion to determine the scope of cross-examination. Mass. G. Evid. § 611(a), (b) (2016). The trial judge permissibly determined that the recordings served little, if any, value to impeach the victim’s identification of the defendant as the individual pouring battery acid into her vehicle’s gasoline tank. The victim’s testimony was based on her own observations, which differed from what the recordings captured, as she did not remain at the same vantage point as the video recorder. See
Commonwealth
v.
Pettijohn,
Conclusion.
We have reviewed the entire record on both the law and the facts pursuant to our obligation under G. L. c. 278,
Judgment affirmed.
Notes
The defendant rejects the timeline of events presented by the Commonwealth and argues that he could not have delivered the package. However, in determining what facts a reasonable juror could have found, we view the facts in the light most favorable to the Commonwealth.
Commonwealth
v.
Latimore,
Again, disregarding testimony put forth by the Commonwealth’s witnesses, the defendant argues that he and Dubis never met and that the conversation never occurred. The jury were entitled to credit the testimony that the meeting took place. See
Latimore,
We have recognized that the art. 12 may provide broader protection of the right to counsel than the Sixth Amendment in circumstances in which “the informant has an articulated agreement with the government that contains a specific benefit or promise.”
Murphy,
The defendant argues that Dubis is receiving a continuing benefit by being placed in a house of correction, rаther than a State prison. However, Dubis secured this arrangement nearly two years before Dubis’s encounter with the defendant. We considered whether Dubis was an agent of the government in the
Tevlin
case, and we concluded that “the evidence was that [Dubis] was moved for safety reasons and that it is common practice to move inmates to prevent retaliation against those who provide information.”
Tevlin,
Recently, we have articulated that the use of prior consistent statements to rehabilitate a witness is permissible where a court finds that a party has claimed that a witness’s in-court testimony is the result of recent contrivance or bias, so long as the prior consistent statement was made before the witness had a motive to fabricate or the occurrence of an event indicating a bias. See Mass. G. Evid. § 613(b)(2) (2016). Our formulation in this case departs only slightly from our more recent articulations, but more precisely reflects the underlying purposes for which prior consistent statements may be used for rehabilitative purposes. See, e.g..
Commonwealth
v.
Novo,
“Reload” ammunition is ammunition that has been repackaged, usually by putting a new projectile, new gunpowder, and a new priming compound into a previously fired cartridge casing. An individual can repackage the ammunition him or herself, or purchase reload ammunition from a manufacturer.
For the first time on appeal, the defendant argues that the introduction of evidence collected from the crime scene by a private company also violated his confrontation rights. However, the introduction of physical items does not constitute hearsay, and therеfore does not implicate the defendant’s confrontation rights. See
Crawford
v.
Washington,
The remainder of Arnold’s testimony, regarding chain of custody and the contents of Busa’s report, was either cumulative or not material. See
Commonwealth
v.
Dagraca,
The defendant also argues that Toto’s opinion — regarding the rarity of that type of white wire with a red stripe — was unreliable, and should have been excluded. This argument is misguided for two reasons. First, defense counsel elicited Toto’s opinion regarding the so-called “rarity” of the wire on cross-examination, in an effort to undermine the credibility of Toto’s investigation. See
Commonwealth
v.
Perez,
The lack of a meaningful, limiting principle is another basis to reject the defendant’s reasoning. Must a Swiss watchmaker have to testify every time the owner of a Swiss watch relies on his watch to testify as to the time of day? Must the city planner be called to verify a witness’s reference to a street sign as a basis for testifying what street occupies a particular location? To ask the question is to answer it.
For the first time on appeal, the defendant objects to the manner in which the transcript was presented to the jury. The victim’s testimony was read aloud by an assistant district attorney (ADA), while another ADA read the questions on direct and defense counsel read the questions on cross-examination. The defendant argues that allowing an ADA to read the victim’s answers risked confusing the jury as to the prosecutor’s role in the case. We disagree. The ADA was not sworn as a witness, and the trial judge instructed the jury that the ADA was reading from a transcript containing the victim’s testimony. “We generally presume that a jury understand and follow limiting instructions . . . and that the application of such instructions ordinarily renders any potentially prejudicial evidence harmless” (citation omitted).
Commonwealth
v.
Crayton,
In
Hurley,
In
Hurley,
Although we decided
Commonwealth
v.
Canon,
When the Commonwealth offers an out-of-court statement in a criminal case, the evidentiary and potential confrontation clause issues can prove challenging. The following conceptual approach may be helpful: First, is the out-of-court statement being offered to establish the truth of the words contained in the statemеnt? In other words, is the out-of-court statement hearsay? If the out-of-court statement is offered for any purpose other than its truth, then it is not hearsay and the confrontation clause is not implicated. Second, if the evidence is hearsay, does the statement fall within an exception to the rule against hearsay? Third, if the hearsay falls within an exception, is the hearsay “testimonial”? Fourth, if the hearsay is testimonial, has the out-of-court declarant been previously subject to cross-examination and is the out-of-court declarant “unavailable” as a matter of law, such that the testimonial hearsay does not offend the confrontation clause?
Any error as to the second purpose did not create a substantial likelihood of a miscarriage of justice. The defense would have used the recordings only in an effort to disprove a prior bad act, a collateral matter cumulative of other evidence showing a hostile relationship. See
Commonwealth
v.
Perez,
