A Jury That Could Not Agree: The Lindsay Clancy Mistrial and the Limits of Criminal Responsibility

If you were sitting in that jury box, staring at a mother accused of killing her own three children, and after eight days you still could not agree on what justice looks like — what would that silence say about you?

That is the question a Massachusetts jury just lived through. Not hypothetically. Today.

The Case Lindsay Clancy, a 34-year-old mother from Duxbury, Massachusetts, is accused of

strangling her three young children — five-year-old Cora, three-year-old Dawson, and seven-month-old Callan — inside their own home in January 2023. After the killings, she reportedly jumped from a second-story window in an apparent suicide attempt. She survived, paralyzed from the waist down. She has pleaded not guilty, with her defense resting on a claim that she was suffering from severe postpartum psychosis at the time and should not be held criminally responsible for what happened.

Since her arrest, she has been held not in prison, but under court-ordered psychiatric treatment at Tewksbury Hospital, awaiting trial.

How This Was Supposed to Work

Massachusetts does not even use the word “insanity” in its courtrooms. The legal term is lack of criminal responsibility, and it is governed by a standard the state’s highest court set in Commonwealth v. McHoul, 352 Mass. 544 (1967) — a standard drawn directly from Section 4.01 of the American Law Institute’s Model Penal Code. Under McHoul, a person is not criminally responsible for an act if, because of a mental disease or defect, they lacked the substantial capacity either to appreciate the wrongfulness of what they were doing, or to conform their conduct to the law.

Crucially, the burden never shifts to the defendant. Once the defense is fairly raised, it is the Commonwealth that must prove, beyond a reasonable doubt, that the defendant was criminally responsible. A psychiatric diagnosis alone proves nothing — the illness has to have destroyed that substantial capacity at the exact moment of the act. That is the needle every juror in this case had to thread: not “was she mentally ill,” but “was she, in that moment, capable of knowing right from wrong and stopping herself.”

The trial ran for months. Prosecutors called more than seventy witnesses — family, first responders, investigators, medical staff — arguing Clancy acted with intention and speed. The defense called its own witnesses, including psychiatric experts who testified that untreated postpartum psychosis had taken her ability to reason. Closing arguments came in late August. The defense described her as a devoted mother failed by inadequate psychiatric care. The prosecution insisted the killings were deliberate. Then the Jury Sat Down — And Could Not Agree

Deliberations stretched on for days. Then the jury told the judge, twice, that they were deadlocked. At that point, Judge Sullivan handed them something heavier than an instruction — he handed them a duty.

He issued what Massachusetts law calls a Tuey-Rodriguez charge, named for two Supreme Judicial Court decisions: Commonwealth v. Tuey (1851) and Commonwealth v. Rodriguez (1973). Stripped of its legal wrapping, the charge tells jurors something close to this: no other group of twelve people will ever be better positioned to decide this case than you are, right now, having sat through every witness and every piece of evidence. It reminds them they have a civic duty to keep trying, to genuinely re-examine the reasoning of jurors who disagree with them — but it also protects the individual conscience of any juror unwilling to abandon an honestly held belief just to end the deadlock. It is sometimes nicknamed the “dynamite charge,” because it is meant to blast a jury loose from a stalemate without coercing anyone’s actual verdict.

The judge sent them back to try again, under the weight of that duty. They still could not agree.

Today, September 4, 2026, after eight days of deliberation, Judge William Sullivan declared a mistrial. No verdict. No resolution. The case, for now, ends in nothing but a hung jury and a room full of people who could not reach the same truth.

What Happens Now

The judge has set a status hearing for later this month. From here, the case can go one of several ways: prosecutors can choose to retry Clancy in front of an entirely new jury, the two sides could reach a negotiated plea, or — if the defense petitions and the court agrees — the case could end without a new trial at all. Nothing is decided. Clancy returns to Tewksbury Hospital while the legal system decides whether to ask twelve more strangers to do what this jury could not.

Now Put Yourself in That Room

Not as a reader. As a juror. You have heard the medical experts. You have heard the timeline. You know three children are dead, and you know the woman accused of killing them was, by every account, catastrophically unwell before it happened.

If it had been your voice in that deliberation room — not as a matter of law, but as a matter of conscience — what would your answer have been?