Lindsay Clancy in court
The jury deliberates on Lindsay Clancy after defence cites postpartum psychosis in killing of her three children Screenshot / YouTube PBS NewsHour

The jury in Lindsay Clancy's murder trial has begun deliberations after her defence team argued that severe postpartum psychosis left her unable to understand that killing her three children was wrong.

Holding up Clancy's journals in court, her lawyer Kevin Reddington told jurors that her writing had deteriorated from coherent entries in September to 'chicken scratch' by January. It was, he argued, physical evidence that 'her mind was gone'.

Nine women and three men retired on Thursday at Plymouth Superior Court in Massachusetts after a five-week trial and two hours of closing arguments. They must decide whether Clancy was criminally responsible for the deaths of Cora, five, Dawson, three, and Callan, eight months, at the family home in January 2023.

Defence Cites Mental Collapse and Failed Care

Reddington described Clancy, a nurse and mother, as a 'darn good mother' whose condition deteriorated after a breakdown in her medical care.

He said five doctors had prescribed 30 medications across 13 psychiatric drugs in the months before the killings, including antidepressants, antipsychotics and sedatives, without enough communication between providers. The drugs, he argued, had the 'opposite' effect intended and helped drive her into acute psychosis.

Clancy's mother, Paula Musgrove, testified that her daughter had become highly paranoid and believed the medication was 'destroying her mind'. Messages from November 2022 showed Clancy telling her former mother-in-law, Susan Clancy, that she was 'terrified of taking meds tonight'.

Forensic Psychiatrist Testifies

Reddington also pointed to her attempts to get help. She called a suicide hotline twice and voluntarily admitted herself to McLean Hospital weeks before the killings.

Forensic psychiatrist Dr Phillip Resnick testified that Clancy was 'clearly psychotic' on the day of the deaths. He said she experienced a 'command hallucination' and was 'almost like a puppet'.

He described the killings as 'altruistic filicide', saying Clancy believed in her delusional state that she was sending her children to safety.

Forensic psychologist Paul Zeizel said Clancy reported hearing a 'male voice ordering her' and lacked the capacity to understand that her actions were wrong.

Prosecution Argues Clancy Planned the Killings

Prosecutor Jennifer Sprague rejected the defence's focus on the healthcare system, telling jurors the case was about whether Clancy knew right from wrong.

Sprague argued that Clancy used a map application to calculate her husband Patrick's travel time to a takeaway restaurant, then called ahead to add a pharmacy stop. That, she said, created the uninterrupted period in which the killings took place.

The prosecution said the deaths took 18 to 20 minutes and involved a series of decisions, including choosing the basement, deciding which child to take first and managing what to say to avoid causing panic.

Prosecution Expert Disputes Psychosis Claim

Dr Gregory Saathoff, the prosecution's forensic psychiatrist, testified that Clancy had bipolar II disorder and depression but was not psychotic. He said the alleged commanding voice stopped immediately after the killings, arguing that committing violence is 'not curative of the voice'.

Saathoff also noted that Clancy had never reported hearing voices to her doctors before the deaths and gave different accounts of them to different evaluators.

Sprague said Clancy had also concealed thoughts of harming her children because she feared being separated from them. 'That's a rational thought,' she told the jury.

Toxicology evidence showed her medications were within therapeutic ranges on the day of the killings. Prosecutors also noted that several drugs blamed by the defence were no longer in her system when she left McLean Hospital in early January.

Five Possible Verdicts for Jury

The jury must reach a unanimous decision on each of the three murder counts. Each count carries five possible outcomes: not guilty, not guilty by lack of criminal responsibility, first-degree murder, second-degree murder or manslaughter.

First-degree murder carries life without parole under Massachusetts law. Second-degree murder carries life with the possibility of parole, while manslaughter carries up to 20 years. Judge William Sullivan also approved involuntary manslaughter as a lesser option requested by the defence.

There is no fixed timetable for deliberations. If the jury cannot reach a unanimous verdict, the judge may declare a mistrial.

A verdict of not guilty by reason of insanity would not mean Clancy walked free. She would instead be committed to a state psychiatric facility, with her status reviewed periodically.