On September 4, 2026, Massachusetts Superior Court Judge William Sullivan declared a mistrial after the 12-person jury said they could not agree on a decision, even after about 38 hours of talks over seven days, NBC News reports.

“At this point, I’m going to declare that the jury is deadlocked and I’m going to declare a mistrial,” Judge William Sullivan said.

The case focused on the deaths of Clancy’s three young children in January 2023: Cora, 5; Dawson, 3; and Callan, 8 months.

Clancy admitted she killed them, but the trial was not about whether she did it. Instead, it was about her state of mind at the time.

Her lawyers argued that Clancy was suffering from severe postpartum psychosis, a serious mental health condition that can happen after childbirth.

They said because of this, she was not criminally responsible and should be found not guilty by reason of insanity.

Prosecutors, however, said she acted with clear intent and should be held fully responsible for the killings.

Court papers showed the jury was deeply split. Notes sent to the judge revealed an 11–1 divide.

Eleven jurors reportedly voted for acquittal, meaning they believed Clancy was not criminally responsible because of her mental state. One juror held out for a conviction.

This caused tension in the courtroom. Clancy’s defence team, led by attorney Kevin Reddington, argued that the lone holdout was not following the law on “reasonable doubt.”

They asked the judge to remove that juror and start deliberations again with a replacement. Judge Sullivan refused.

The defence then made an emergency appeal to the Massachusetts Supreme Judicial Court, asking it to step in.

The state’s highest court rejected the request, clearing the way for the mistrial. A mistrial is not the same as a not-guilty verdict.

It simply means the trial ended without a final decision. Because of this, the charges against Clancy are still active.

According to the BBC, the next move now lies with Plymouth County District Attorney Timothy Cruz. He must decide whether to try the case again with a new jury.

Cruz told reporters he had not yet made a decision but would announce one “shortly.” He stressed that his choice would be based on the law and evidence, not public pressure.

After the mistrial, Clancy was returned to Tewksbury Hospital, where she has been held during the trial.

A status hearing is set for September 29, 2026. At that hearing, the court will review the next steps, including whether a retrial will happen and what the timeline might look like.

For now, the case remains unresolved, leaving both the legal system and the public waiting to see if Clancy will face a second trial.