Lindsay Clancy trial: Judge declares mistrial after emergency request denied

The defense blamed one juror for the deadlock.

Last Updated: September 4, 2026, 4:42 PM EDT

The murder trial of Lindsay Clancy, the Massachusetts mom who killed her three young children while in the family's home on Jan. 24, 2023, ended Friday in a mistrial after seven days of juror deadlock.

Clancy's defense attorney, Kevin Reddington, claimed throughout that trial that she was suffering from postpartum psychosis when she strangled her children and attempted to take her own life. The prosecutors, Jennifer Sprague and Shanan Buckingham, argued that Clancy -- who pleaded not guilty to three counts of first-degree murder -- is criminally responsible for her children's deaths.

Judge William Sullivan, who oversaw the trial, set a court date of Sept. 29, 2026, to reconvene and determine next steps.

See below how the final days of the trial unfolded.

Watch a special edition of "20/20," "The Trial of Lindsay Clancy," airing Friday, Sept. 4, at 9/8c on ABC, streaming the next day on Disney+ and Hulu.

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Sep 04, 2026, 2:00 PM EDT

Single justice hears oral arguments over defense request for intervention

A single justice of the Massachusetts Supreme Judicial Court heard brief oral arguments Friday on the defense request for emergency intervention.

The justice quickly adjourned the hearing to make a decision.

Clancy's attorney, Reddington, argued intervention is necessary to avoid a mistrial.

"It is also necessary to preserve the Defendant's right to a fair trial by unbiased jurors applying the law and to avoid violating the Equal Protection Clause of the Fifth and Fourteenth amendments and Article 114, which makes mental illness a protected category," the defense motion stated.

The defense motion for emergency intervention was devoid of case law that would establish precedent for what Reddington is asking for. Instead he wants the state's highest court to step in to "preserve the integrity of the court system."

Reddington faulted the judge overseeing Clancy's trial, Sullivan.  

"The Superior Court has abdicated its responsibility to ensure the integrity of the jury by refusing either to inquire further or to dismiss the juror who is refusing to consider doubt as the law states," Reddington's motion stated.  

He also faulted the juror, saying their refusal to apply any doubts they have acknowledged during deliberations reflects "a bias against those who suffer from debilitating mental illness."

Prosecutors have argued Sullivan properly exercised his discretion to declare the mistrial after seven days of deadlock.

Sep 04, 2026, 1:49 PM EDT

Massachusetts Supreme Judicial Court to hold hearing

The Massachusetts Supreme Judicial Court will hold a hearing regarding Clancy's defense attorney's emergency request for relief.

Sep 04, 2026, 1:33 PM EDT

Clancy's legal team files petition with Massachusetts Supreme Judicial Court

A representative for Lindsay Clancy's legal team says they have now filed a petition with the Massachusetts Supreme Judicial Court.

Reddington is asking the Massachusetts Supreme Judicial Court to effectively force Sullivan to allow the jury to continue deliberating.

Prosecutor Jennifer Sprague addresses the court as discussions take place to potentially declare a mistrial in the triple murder trial of Lindsay Clancy in Plymouth Superior Court, in Plymouth, Massachusetts, September 4, 2026.
Court Pool Feed
Sep 04, 2026, 11:53 AM EDT

Clancy rests head on table, supporters crying as judge nears mistrial

Lindsay Clancy put her head on the table as her case neared a mistrial.

Several of her supporters are crying in the bathroom.

Courtroom spectators looked shocked when the judge said he planned to declare a mistrial and further surprised when he gave the defense an hour to ask the Massachusetts Supreme Judicial Court to intervene.

The court is in a state of suspended tension awaiting an outcome.

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