The case of Lindsay Clancy, a former labour and delivery nurse from Massachusetts, has drawn sustained attention in the United States since the deaths of her three young children in January 2023. Clancy, who was 36 when the case reached trial, has acknowledged killing the children but has maintained that she should not be held criminally responsible because she was suffering from severe postpartum psychosis.
The legal battle over her mental state reached a major turning point on September 4, 2026, when a 12-member jury was unable to reach a unanimous verdict after about five weeks of testimony and seven days of deliberations. The judge subsequently declared a mistrial, leaving the murder charges unresolved and opening the possibility of a new trial.
Clancy’s case centres on a difficult question of criminal responsibility: whether the mental illness she was experiencing at the time of the killings prevented her from understanding the nature and consequences of what she was doing or from being held legally accountable for it.
Who is Lindsay Clancy?
Lindsay Marie Clancy, formerly Lindsay Marie Musgrove, was born in 1990 in Wallingford, Connecticut. She attended Quinnipiac University, trained as a nurse and eventually worked at Massachusetts General Hospital, where her professional duties included caring for women during childbirth.
She married Patrick Clancy in 2016, and the couple established their home in Duxbury, Massachusetts. They had three children: Cora, born in December 2017; Dawson, born in September 2019; and Callan, born on May 26, 2022.
According to the account presented in the case, Clancy had experienced postpartum anxiety after the births of her first two children but recovered from those episodes. Her condition changed considerably following the birth of Callan.
She subsequently experienced severe anxiety and depression, insomnia, emotional numbness and intrusive thoughts involving harm to herself and her children. She also experienced suicidal thoughts and sought medical assistance from several doctors.
Clancy was prescribed a combination of medications, including antidepressants, anti-anxiety medication and antipsychotic drugs. In early January 2023, she voluntarily admitted herself to McLean Hospital, a psychiatric facility, for treatment.
She was discharged approximately three weeks before the killings.
Her defence later argued that the treatment she received had been inadequate and that she had been misdiagnosed and overmedicated. According to the defence position, her deteriorating mental state ultimately developed into full postpartum psychosis.
What happened on January 24, 2023?
The events of Tuesday, January 24, 2023, became central to the prosecution and defence cases.
Earlier that day, Clancy took Cora to a routine medical appointment. She subsequently spent time playing in the snow with her children. She also exchanged ordinary text messages with Patrick, conduct the defence later used in presenting the broader context of her mental state.
During the afternoon, Clancy searched online for children’s laxative medication and a restaurant and checked travel times. At about 5pm, she asked Patrick to leave the family home to obtain takeaway food and the medication.
Patrick was away for approximately 55 minutes.
During that period, according to the evidence presented in the case, Clancy took the three children to the basement and strangled them one after another using exercise resistance bands.
Afterward, she cut her wrists and neck and jumped from a second-storey bedroom window in what was described as an apparent suicide attempt. The fall caused injuries that left her paralysed from the waist down.
Patrick returned to the house and initially noticed that it was unusually quiet. He found blood in the master bedroom and an open window before discovering his injured wife outside in the backyard.
The emergency call made afterward became one of the most significant pieces of evidence heard during the trial.
According to court records reported by The Boston Globe, Patrick can be heard speaking to Clancy before screaming after discovering the children: “She killed the kids!”
Cora and Dawson were pronounced dead that night.
Callan, the youngest child, was found in cardiac arrest. Medical personnel resuscitated him and transported him by air to Boston Children’s Hospital, where doctors determined that he had no brain activity.
He remained on life support until it was withdrawn on Friday, January 27, 2023. The Plymouth County District Attorney’s Office and reports by the Associated Press said he was officially declared dead at 11:18am. Callan was eight months old.
The deaths left the family at the centre of a criminal investigation that would eventually become a closely watched test of how Massachusetts courts deal with severe postpartum mental illness and criminal responsibility.
Patrick Clancy’s response
In the aftermath of the killings, Patrick initially spoke publicly about his wife in remarkably compassionate terms. Rather than portraying her solely as a criminal, he described her as a loving mother who had been battling severe mental illness.
He publicly urged people to show compassion toward her.
The couple later divorced. Patrick has since remarried and helped establish a foundation dedicated to preserving the memory of Cora, Dawson and Callan.
The charges against Clancy
Clancy was charged with three counts of first-degree murder as well as related offences. She has been held at Tewksbury State Hospital, a psychiatric facility.
Importantly, Clancy has never denied killing her children. Instead, her defence has centred on whether she was legally responsible for those deaths.
Her lawyer, Kevin Reddington, entered a plea of not guilty by reason of lack of criminal responsibility, the Massachusetts equivalent of an insanity defence.
The defence therefore had to persuade the jury that Clancy’s mental condition was sufficiently severe at the time of the killings to relieve her of criminal responsibility.
Defence says postpartum psychosis controlled her actions
Reddington’s team argued that Clancy was experiencing postpartum psychosis, a rare and severe mental illness associated with the period following childbirth.
The condition can involve hallucinations, delusions and command voices, and defence witnesses testified that Clancy experienced symptoms of that nature.
Among the expert witnesses was forensic psychiatrist Dr Philip Resnick. He testified that Clancy heard a male voice instructing her to kill her children and subsequently kill herself.
According to the testimony presented by the defence, Clancy described feeling controlled by the voice “like a puppet.”
Her lawyers also argued that she had repeatedly tried to obtain professional assistance before the killings. They maintained that her deteriorating condition had not been properly recognised and that the treatment she received contributed to rather than alleviated her psychiatric crisis.
The defence’s argument was therefore not that the deaths did not occur or that Clancy was not responsible for carrying them out physically. Rather, it was that her mental illness meant she lacked the criminal responsibility required for a murder conviction.
Prosecutors challenge the insanity defence
Prosecutors accepted that Clancy had experienced serious mental-health problems but disputed the defence’s conclusion that those problems eliminated her criminal responsibility.
The prosecution pointed to evidence they said demonstrated planning and deliberate conduct before and during the killings.
Among the circumstances highlighted was Clancy’s decision to send Patrick out of the house to obtain food and medication. Prosecutors also focused on the sequence of the killings and the method used to strangle the children.
They further pointed to what happened afterward, including Clancy’s later request for a lawyer, as evidence relevant to their argument that she understood what she had done and remained capable of making deliberate decisions.
Assistant District Attorney Shanan Buckingham told jurors that the evidence would demonstrate that Clancy deliberately killed her children.
The prosecution therefore sought to persuade the jury that although Clancy’s mental health was an important part of the case, it did not remove her legal responsibility for the deaths.
Five weeks of testimony
Clancy’s trial began in July 2026 at Plymouth Superior Court and continued for approximately five weeks.
More than 80 witnesses appeared during the proceedings. They included Patrick Clancy, relatives, medical experts and emergency responders.
Jurors were presented with the 911 call made after Patrick returned home, as well as evidence from the crime scene and testimony concerning Clancy’s mental health and treatment.
The proceedings required the jury to consider two competing explanations for the same sequence of events.
The defence sought to establish that postpartum psychosis had overwhelmed Clancy’s ability to act with criminal responsibility, while prosecutors argued that evidence surrounding the events showed intentional conduct that remained legally punishable.
After the evidence was completed, the jury spent seven days deliberating.
Jury fails to reach unanimous verdict
The jury ultimately could not reach the unanimous decision required to resolve the case.
Reports indicated that the jury was divided 11–1 in favour of finding Clancy not guilty by reason of insanity. Because the jury could not reach the required unanimous verdict, the court was unable to enter either a conviction or an acquittal.
On September 4, 2026, Judge William Sullivan declared a mistrial.
Clancy’s lawyer subsequently made an emergency appeal to the Massachusetts Supreme Judicial Court concerning the holdout juror. The appeal was denied.
The mistrial does not mean that Clancy was found innocent, nor does it mean she was convicted. It leaves the criminal case unresolved.
What happens to the case now?
Because there was no unanimous verdict, the three murder charges remain pending.
Clancy continues to be held at Tewksbury State Hospital, and the next major decision rests with Plymouth County District Attorney Timothy Cruz.
The prosecution may decide to bring the case before another jury. It could also pursue a plea agreement or take another legal course available under Massachusetts law.
A status hearing is scheduled for later in September 2026.
The possibility of a retrial means the central dispute in the case remains unresolved. If prosecutors pursue another trial, the question of Clancy’s mental state at the time of the killings is again likely to become central.
The case has consequently moved into a new legal phase rather than reached a final conclusion. Clancy remains charged with the deaths of Cora, Dawson and Callan, but the jury’s failure to reach a unanimous verdict means no final criminal judgment has been entered against her.
For the families involved, the mistrial leaves a painful case without a definitive verdict. For the court, prosecutors and defence, the next proceedings will determine whether the three murder charges are tried again or resolved through another legal process.
Lindsay Clancy Case: What to Know About the Massachusetts Mother Charged in Deaths of Her Three Children
