Testimony ends in Lindsay Clancy triple-murder trial as closing arguments near

Testimony concluded Wednesday in the murder trial of Lindsay Clancy, the Duxbury, Massachusetts mother accused of strangling her three young children in 2023, setting up closing arguments for Thursday morning in a case that has drawn national attention to postpartum psychiatric illness and the insanity defense.

Prosecutors rested their rebuttal case after 21 days of testimony and more than 70 witnesses in Plymouth County Superior Court, according to WBUR and The Boston Globe, both of which covered the proceedings live. Judge William Sullivan told attorneys each side will have one hour Thursday morning for closing statements, after which he will instruct jurors on the law before deliberations begin, possibly by midday.

The case

Clancy, 36, has pleaded not guilty by reason of lack of criminal responsibility to three counts of first-degree murder in the deaths of her children — Cora, 5; Dawson, 3; and Callan, 8 months — at the family's home on Summer Street in Duxbury on Jan. 24, 2023. According to the Plymouth County District Attorney's office, Duxbury police responded to a 911 call reporting a suspected suicide attempt at the home shortly after 6 p.m. that day and found Clancy after she had jumped from a second-story window; first responders then discovered the three children unresponsive in the basement. The Massachusetts Office of the Chief Medical Examiner determined the children died of asphyxia, according to the same release. Clancy was left paralyzed from the waist down by the fall.

She was indicted on three counts each of murder and strangulation and, per the district attorney's arraignment announcement, was ordered held without bail and treated at a state medical facility pending trial. She has since been housed at Tewksbury State Hospital.

Dueling experts on her state of mind

The case turns almost entirely on competing psychiatric assessments of what Clancy understood and controlled in the hours before the killings. Defense experts testified she was in the grip of postpartum psychosis, a rare but severe psychiatric emergency, compounded by a rapid succession of psychiatric medications prescribed in the weeks before the deaths, and that she heard commanding voices she could not resist. One defense psychiatrist testified, according to WBUR's account of his testimony, that Clancy described a male voice ordering her to act and said she felt an external force controlling her body in a dream-like state.

Prosecutors called their own experts to rebut that account. Forensic psychiatrist Dr. Gregory Saathoff, the government's final witness, testified that Clancy exercised control that day — searching for restaurant and pharmacy locations and communicating with her daughter's pediatrician — and that the killings involved "significant planning," according to the Globe's live coverage. Forensic psychologist Dr. Kirk Heilbrun, who evaluated Clancy at Tewksbury years after the killings, testified he found inconsistencies across her accounts of hearing voices and concluded she was not experiencing postpartum psychosis, in part because the episode fell outside the roughly four-week window typically associated with the condition. Heilbrun characterized her actions instead as an instance of "altruistic filicide" — a parent killing children out of a delusional belief it will spare them suffering.

On cross-examination, defense attorney Kevin Reddington challenged the timing and scope of Heilbrun's evaluation, which took place more than three years after the deaths, and questioned his depth of experience specifically with postpartum psychiatric conditions.

"All of the evidence seemed to have spoken to her being a terrific mother, a wonderful wife. And the only way to make sense of any of this is that she had to be severely mentally ill," Janice Bassil, a defense attorney who specializes in insanity-defense cases and has followed the trial, told WBUR.

A rare defense, a consequential ruling

Massachusetts' insanity standard requires the defense to show Clancy lacked "substantial capacity" either to appreciate the wrongfulness of her conduct or to conform her behavior to the law. Judge Sullivan on Wednesday denied a defense request for a mistrial after prosecutors raised Clancy's Catholic faith during testimony, though he admonished prosecutors over the line of questioning. He also indicated he will instruct jurors that they may consider a manslaughter conviction as an alternative to murder or a not-guilty-by-reason-of-insanity finding, a decision that widens the range of possible outcomes for the jury, according to ABC News' coverage of the ruling.

If convicted of first-degree murder, Clancy faces a mandatory sentence of life in prison without the possibility of parole. If jurors find her not guilty by reason of lack of criminal responsibility, she would be committed to a state mental health facility, subject to periodic review for potential release. A manslaughter conviction would carry a lesser, non-mandatory sentence.

Who is affected, and why the case has drawn wider attention

The trial has been followed well beyond Massachusetts because it has become a focal point for public debate over maternal mental health care — specifically postpartum psychosis, a condition estimated by clinicians to affect roughly one to two of every 1,000 births and that can escalate rapidly into psychiatric emergency. Groups advocating for expanded postpartum screening and crisis-response protocols have pointed to the case in pushing for changes to how obstetric and psychiatric providers coordinate care for new mothers on multiple medications, an issue that surfaced repeatedly in testimony about Clancy's treatment history in the months before the killings. Supporters of Clancy have periodically gathered outside the courthouse during the trial, while relatives of the children, including their father, Patrick Clancy, have attended proceedings and, at points, testified.

What happens next

Closing arguments are set for Thursday morning, with prosecutors and the defense each given one hour before Judge Sullivan delivers jury instructions. Deliberations could begin as early as Thursday afternoon. Given the technical nature of the state's criminal-responsibility standard and the volume of expert testimony — more than 20 mental-health witnesses appeared across both sides over three weeks — attorneys who have followed the case have not predicted how quickly jurors might reach a verdict. The trial has already run longer than most Massachusetts murder cases, a reflection of the volume of psychiatric evidence presented by both sides.