Withdrawing a Guilty Plea After Later-Discovered Police Misconduct

Police misconduct sometimes comes to light years after a defendant has pleaded guilty. When that happens, the defendant may ask the court to withdraw the plea. Success depends on connecting the misconduct to that specific case, not merely showing that it occurred somewhere in the investigation. On August 31, 2026, the Supreme Judicial Court applied that rule in Commonwealth v. Hood, SJC-13818, and affirmed the denial of a motion to withdraw guilty pleas entered in 1995. The decision sets out what a Massachusetts defendant must prove when evidence of police corruption surfaces after a conviction.

Police-misconduct scandals in Massachusetts have reopened many old convictions. Hood marks the limit of that remedy. Corruption proven in one investigation does not, by itself, undo a plea in a different case.

The Decision in Commonwealth v. Hood

In June 1995, Craig Hood pleaded guilty to two counts of murder in the second degree and related firearm charges. The charges arose from the 1993 shooting deaths of two women in the Mattapan section of Boston. By pleading guilty to second-degree murder, Hood avoided the risk of two mandatory sentences of life without the possibility of parole.

In July 2020, Hood moved to withdraw his pleas. He argued that the Commonwealth had failed to disclose exculpatory evidence, that newly discovered evidence undermined his guilt, that his plea counsel was ineffective, and that his pleas were involuntary. His arguments drew on the investigation into the murder of Boston police Detective John Mulligan, an investigation later shown to have been compromised by serious police corruption. Some detectives worked on both the Mulligan investigation and the investigation into the murders to which Hood pleaded guilty.

A Superior Court judge held an evidentiary hearing and denied the motion. The Supreme Judicial Court granted direct appellate review and affirmed.

The Standard for Withdrawing a Guilty Plea

A motion to withdraw a guilty plea is treated as a motion for a new trial under Mass. R. Crim. P. 30 (b). A judge may allow it “any time it appears that justice may not have been done.” Commonwealth v. Scott, 467 Mass. 336, 344 (2014).

On appeal, the reviewing court asks whether the motion judge abused her discretion or committed a significant error of law. Commonwealth v. Henry, 488 Mass. 484, 490 (2021). Where the judge held an evidentiary hearing, the appellate court accepts findings supported by the record and defers to the judge’s credibility determinations. The court decides for itself whether the judge applied constitutional principles correctly.

The Materiality Requirement

Hood’s claims about withheld evidence, newly discovered evidence, and ineffective assistance all turned on one showing. He had to prove a reasonable probability that he would not have pleaded guilty had he known the Mulligan investigation material, and that rejecting the plea offer would have been rational. Commonwealth v. Lastowski, 478 Mass. 572, 577 (2018). The question is not whether the information had some arguable value. The question is whether it “would have materially influenced” the decision to plead guilty. Scott, 467 Mass. at 360.

The court held that the material failed that test. Some of it addressed who killed Mulligan, not who killed the two women three days later. Some of it was cumulative, because plea counsel already possessed the core facts of the third-party culprit theory. A third-party culprit defense requires acts “so closely connected in point of time and method of operation” that they raise doubt about the defendant’s identification. Commonwealth v. Andrade, 488 Mass. 522, 532 (2021). Motive alone does not satisfy that standard.

The court also weighed the strength of the Commonwealth’s case. That case included a detailed confession containing facts only the killer would have known, ballistics evidence, and a witness who placed Hood at the scene. Against that evidence, Hood identified no substantial defense that would have made rejecting the pleas rational.

Egregious Government Misconduct and the Nexus Requirement

Hood also argued that police corruption rendered his pleas involuntary. A plea may be defective where government misconduct that has since been discovered induced it. To withdraw a plea on that ground, a defendant must show two things. First, that egregious government misconduct took place in connection with his case and preceded the plea. Second, that the misconduct was material to his decision to plead. Commonwealth v. Hallinan, 491 Mass. 730, 744 (2023); Commonwealth v. Claudio, 484 Mass. 203, 206 (2020).

The first requirement decided the case. It demands a nexus between the misconduct and the defendant’s own case. Commonwealth v. Ruffin, 475 Mass. 1003, 1004 (2016). The court found no such nexus. The corruption proven in the Mulligan investigation gave those officers a specific incentive to short-circuit that investigation. No comparable evidence connected the corruption to the investigation of the two murders here.

The court rejected the broader argument that a poisoned investigation poisons every investigation it touches. Shared detectives, shared witnesses, and shared leads do not transfer corruption from one case to another. The inquiry asks whether misconduct infected the investigation of this defendant.

The Limits of the Drug-Laboratory Presumption

Hood asked the court to presume that egregious misconduct occurred in his case. Massachusetts law does supply a conclusive presumption of government misconduct in narrow circumstances. The court created that presumption for defendants affected by a State drug-laboratory chemist’s misconduct, because there it would have been impossible for those defendants to show the required nexus. Scott, 467 Mass. at 352; Hallinan, 491 Mass. at 747.

Those conditions were absent here. Hood did not show that establishing a nexus was impossible. The presumption is a remedy for systemic misconduct that taints an entire category of cases, not a substitute for proof in an individual case.

Challenging the Voluntariness of a Confession

Hood argued last that the officers coerced his confession. A voluntary statement is the product of a rational intellect and a free will, not induced by physical or psychological coercion. Commonwealth v. Williams, 486 Mass. 646, 659 (2021).

The court explained an important distinction. Evidence that an officer engaged in misconduct in other matters may serve as impeachment material. Matter of a Grand Jury Investigation, 485 Mass. 641, 652 (2020). It does not, without more, establish that a confession in a separate case was involuntary. Hood identified no coercive act during his interrogation. The content of his confession, corroborated by independent evidence, supported the finding that it was reliable.

What the Decision Means for Defendants

Hood confirms that later-discovered police misconduct can support a motion to withdraw a guilty plea in Massachusetts. It also confirms the limit on that remedy. The defendant carries the burden of tying the misconduct, or the withheld evidence, to his own case and to his own decision to plead.

That burden is a factual one, and it is met with a developed record. An effective motion identifies the specific evidence, shows how it connected to the defense, and explains why an informed defendant would have gone to trial. A defendant who believes that misconduct or nondisclosure affected his conviction should have the record reviewed by counsel, because the strength of the motion depends on the connections the record can prove.

Attorney Joe Serpa represents people seeking to challenge convictions and guilty pleas in Massachusetts. This office reviews the plea record, the discovery history, and any later-discovered evidence to assess whether a motion for a new trial is supported.