The Constitution requires both that a criminal defendant be given a fair and impartial trial and that the government’s conduct of the trial be free from all that is deliberately devious or inconsistent with the highest standards of professional conduct. Cf.
Commonwealth
v.
Paiva,
The defendant was convicted by a Superior Court jury of burglary and of burning a dwelling house. He argues on appeal that his motion for a mistrial, made after a key prosecution witness changed a material part of his testimony with no prior disclosure to defense counsel, was improperly denied. He argues also that certain jury instructions created a substantial risk of a miscarriage of justice, that he was denied effective assistance of counsel, and that his motion for a new trial, based on newly discovered evidence, should have been allowed. We conclude that the defendant’s motion for a mistrial was improperly denied and that he is entitled to a new trial. We address briefly the other issues rаised on appeal only insofar as they may have relevance on retrial.
The record reveals the following. During the early morning hours of February 22, 1986, the victim, Dorothy Quinn, awoke to the sound of two male voices in the hallway outside her bedroom in her three-story house in Marshfield. Fearing that the intruders would hear her if she tried to call thе police, Quinn climbed onto the floor next to her bed in an attempt to hide. Quinn testified at trial that the two men came into her bedroom and went through her bureau and closet, apparently looking for jewelry and other valuables. She heard the screech of a smoke alarm and then noticed that the closet in her bedroom was on fire. When the two men left her bedroom, she got up from the floor, jumped out of the bedroom window to the ground some four feet below, and ran to a neighbor’s house to call the police and fire departments. 1 Quinn never saw the individuals who were in her house.
Detective Teague also investigated the crime scene and prepared a police report on his investigation. The report described “two sets” of footprints which he had observed at the house: one from a size twelve work boot with two stars in the center of the heel, and the other from a size nine sneaker with a wavy print. Before the grand jury, Teague testified that he observed “two sets of footprints on the ground.”
At trial, however, Teague’s testimony changed: Asked to describe the tracks at the crime scene, he described three sets of footprints — one set with a star impression, another of a “wavy type,” and a third with “little small circles or wavy type prints, . . . similar to the second set.” He then, using a chalkboard, described where the tracks were found. The prosecutor asked, “Now, behind the house, did you see a set that was diffеrent from the two you have just described?” Defense counsel objected. The objection was overruled, and Teague again described three sets of footprints.
Shortly thereafter, defense counsel moved for a mistrial
2
on the grounds that she had not previously been notified of the existence of the third set of footprints, that Teague’s testimony was inconsistent with his police report and with his grand jury testimony, and that she had been unfairly surprised by his testimony at trial. The judge denied the motion
During the continued direct examination of Teague which ' followed, Teague authenticated one of the photographs taken at the house that night as depicting two different footprints, “one on top of the other.” In addition, he testified that that same photograph, which was admitted in evidence, over the defendant’s objection, as exhibit 19, depicted the third set of footprints to which he had alluded previously.
On cross-examination, Teague acknowledged that in his police report and at the grand jury hearing he had mentioned only two sets of footprints and that he had never mentioned a third set of footprints until he took the witness stand at trial.
Two codefendants, Steven Crowley and Jeff Colby, who had pled guilty to their involvement in this crime, testified for the Commonwealth at Vaughn’s trial and implicated Vaughn as the instigator of the crime. A third government witness, one Judson Hill, testified at trial that, several days after the break-in, Vaughn admitted to him his involvement in the burglary at the Quinn house.
Vaughn testified in his own defense that he was at home in bed at the time of the incident. He denied having had the conversation with Judson Hill.
James Harrington, an assistant investigative officer for the Plymouth County bureau of criminal investigation, testified for the defense that he had taken photographs at the scene for the police and fire departments and that he had observed only two sets of footprints at the scene of the crime.
1.
Motion for mistrial.
The defendant asserts that there was a failure to disclose mаterial exculpatory evidence, in violation of the principles set forth in
Brady
v.
Maryland,
Teague’s change in testimony, that suddenly he had evidence of three footprints, is more than a mere “shift [] in detail only” and goes to the heart of the defendant’s case. See
Commonwealth
v.
Baldwin,
To make matters worse, the prosecution appears to have been aware of the new evidence in advance and cleverly to have prompted this testimony while Teague was on the stand.
4
The Commonwealth’s behavior in failing to disclose such a material change in testimony amounts to much more than a mere error of judgment or an instance of inadvertence or carelessness by the prosecutor.
5
6Cf.
Commonwealth
v.
Gil
“The grant of a mistrial followed by a new trial is the relief typically granted where a defendant is prejudiced by a prosecutor’s failure to disclose properly exculpatory, material evidence.”
Commonwealth
v.
Lam Hue To,
In the circumstances of this case we can easily “see how the defense would have altered [its] tactic [s] if it had been informed earlier ... .”
Commonwealth
v.
Pizzotti,
Although the defendant did have the opportunity to cross-examine Teague аnd to bring out the inconsistencies in his testimony, this cross-examination was not as thorough as it could have been. “In retrospect, it may be thought that counsel did not use [the changes in testimony] to maximum advantage .... But the defendant should not be held to a strict standard in order to patch over the prosecution’s conduct.”
Commonwealth
v.
Ellison,
We also find compelling the defendant’s argument regarding the lack of opportunity to have exhibit 19 examined by an expert.
7
While the defendant may have known of the existence of exhibit 19, he, without any warning, could not reasonably anticipate that a Commonwealth witness would testify that three sets of footprints could be seen on this photograph rather than two. Given the prosecution witness’s testimony that the photograph showed three sets of footprints, we think that the defendant was prejudiced by his lack of opportunity to obtain expert testimony regarding exhibit 19 on his behalf. In sum, the circumstances of this case were such that the delayed disclosure “affected the outcome
Deciding as we do that the defendant’s motion for a mistrial was improperly denied, we need not also decide the propriety of the denial of the defendant’s motion for a new trial. We note, however, that the Commonwealth’s failure to disclose Teague’s change in testimony effectively transformed exhibit 19 into “newly discovered evidence.” In an affidavit accompanying the new trial motion, an expert who examined the photographs after the trial states that in his opinion the photographs “probably depict only two” sets of footprints. See note 7,
supra.
Because this evidence is clearly material and “casts real doubt on the justiсe of the conviction”
(Commonwealth
v.
Grace,
2.
Jury instructions.
We comment briefly on the trial judge’s use of the familiar “footprints in the snow” anаlogy in her instructions on circumstantial evidence. Although we do not think the judge committed reversible error, see
Commonwealth
v.
Gil,
3.
Ineffective assistance of counsel.
Neither trial counsel’s failure to call one Matt Henry, a witness whosе testimony would contradict, as well as corroborate, the defendant’s testimony (compare
Commonwealth
v.
Rondeau,
Judgments reversed.
Verdicts set aside.
Notes
The police and fire departments responded to the scene. Fires had been set in the kitchen and in the bedroom closet.
The defendant moved for a mistrial immediately after a luncheon recess which was taken in the midst of direct examination. The Commonwealth argues that the defendant’s motion for a mistrial was not timely and that the issue has not been properly preserved for appellate review. We do not agree. Contrast
Commonwealth
v.
Foster,
Moreover, “[t]he distinction between inculpatory and exculpatоry evidence is not significant where the issue is delayed disclosure, as opposed to failure to disclosure.”
Commonwealth
v.
Baldwin,
The prosecutor posed the following question, which the witness was allowed to answer оver defense counsel’s objection: “Now," behind the house, did you see a set that was different from the two you have just described?” (Emphasis supplied.) The witness responded: “There were two sets of wavy prints and one set of heavy prints with the star on them.”
We think that this tactic could be called, to use the vernacular, a “sucker punch.” Cf.
Commonwealth
v.
Fleury-Ehrhart,
The defendant also argues that with advance notice, he could have called an expert witness in order to dispute the description and interpretation of exhibit 19 which had been offered by Teague. Seе note 7, infra.
The defendant did obtain an expert opinion regarding exhibit 19 after the trial, and an affidavit from that expert was attached to and made a part of the defendant’s motion for a new trial. The expert examined all of the photographs, including an enlargement of exhibit 19. He noted that exhibit 19 is of “poor quality” and that it is “оut of focus.” He also stated that “it is not possible to identify with certainty any shoe print in the photograph,” but, to the “extent that [he can] discern anything resembling a shoe print” in the photograph, “it appears to be a print similar to, if not identical to” one of the other footprints at the scene. In his opinion, the photographs “probably depict only two” sets of footprints.
