Tensions exploded inside a Massachusetts courtroom Thursday as the deadlocked jury in the Lindsay Clancy murder trial erupted into open rancor — with the forewoman firing off a blistering note to the judge accusing a lone holdout of flat-out refusing to follow the law.

Judge William Sullivan refused to boot the stubborn juror, telling the panel to keep deliberating after a stunning sixth day that laid bare the raw divisions inside the jury room.

Clancy, 36, is on trial for first-degree murder in the deaths of her three young children — Cora, 5, Dawson, 3, and 8-month-old Callan — strangled in the basement of the family's Duxbury home on a snowy January night in 2023.

'Refuses to listen to the law'

The bombshell came mid-morning when the jury forewoman sent Sullivan a note complaining that one juror was refusing to follow the court's instructions on reasonable doubt — the gold standard of the American justice system.

The juror "refuses to listen to the law... on reasonable doubt," the forewoman wrote, according to defense attorney Kevin Reddington.

Reddington, a veteran courtroom brawler, demanded the judge remove the holdout. Sullivan shot him down.

"I don't feel it is proper for me to side with one side or the other of the deliberations," Sullivan ruled from the bench.

Prosecutor Jennifer Sprague backed the judge's call, telling reporters there was "no way to determine what the deliberations are, who's correct, who's incorrect, nor should we attempt to."

A man in a yellow shirt covers his face inside the Plymouth Superior Courtroom
A courtroom observer covers his face during the sixth day of deliberations in Plymouth Superior Court on Sept. 3, 2026. (Reuters)

35 hours and counting

The jury of nine women and three men has now deliberated for roughly 35 hours over six days without reaching a verdict. The panel has twice before told the judge they were deadlocked — but Thursday was the first time the public got a glimpse of outright hostility behind closed doors.

Sullivan hauled each juror into the courtroom one by one for private questioning, reminding them they must unanimously believe Clancy is guilty beyond a reasonable doubt to convict.

The former labor and delivery nurse doesn't deny killing her children. Her defense hinges on a single argument: she was drowning in postpartum psychosis and couldn't tell right from wrong when she used exercise bands to strangle her two sons and daughter.

Wheelchair and a whisper

Clancy, paralyzed from the waist down after she jumped from a second-floor window moments after the killings, was wheeled into court by Reddington to join the bench conference about the deadlock.

The veteran lawyer looked visibly shaken — at one point wrapping his arm around his client and consoling her as journalists filed out of the courtroom.

The holdout juror issue is expected to be addressed again first thing Friday morning. If the panel stays hopelessly deadlocked and Sullivan declares a mistrial, prosecutors will have to decide whether to drag Clancy back to court for a second trial.

What's at stake

The stakes could not be higher. A conviction on three counts of first-degree murder means life in prison without the possibility of parole.

An acquittal by reason of insanity — what Massachusetts calls "lack of criminal responsibility" — would send Clancy to a state psychiatric hospital, not a prison cell.

The case has gripped America since that freezing January night, splitting public opinion between those who see a monster and those who see a mother destroyed by a mental illness the system failed to catch.

Under U.S. law, the burden falls entirely on the government to prove guilt beyond a reasonable doubt — the strictest standard in the American legal system. The accused never has to prove innocence.