A Massachusetts mother is on trial for the deaths of her three young children. But the central question in the Lindsay Clancy case is not simply whether she killed them.
The defence does not dispute that Clancy strangled the children. The fight is over whether she was criminally responsible for what she did.
Her defence says she was suffering from severe postpartum psychosis and had lost the ability to understand or control what she was doing. Prosecutors say she acted deliberately and remained responsible for her actions.
That clash has turned the trial into a much bigger debate about motherhood, mental health, medical care and criminal responsibility. It has also triggered conspiracy theories online, including unfounded claims about Clancy's husband, Patrick.
Here is the case from the beginning.
What happened to the three children?
On 24 January 2023, Lindsay Clancy was at her family's home in Duxbury, Massachusetts, with her three children: five-year-old Cora, three-year-old Dawson and eight-month-old Callan.
According to the case presented in court, Patrick Clancy left the house to pick up food and medication.
When he returned, he found Lindsay outside after she had jumped from a second-floor window. She had also seriously injured herself in what prosecutors and investigators treated as an apparent suicide attempt. The injuries left her paralysed from the waist down.
Patrick then discovered the children in the basement.
The children had been strangled with exercise bands. Clancy's defence does not dispute that she caused their deaths. She has pleaded not guilty to three counts of first-degree murder.
Why does the defence say she killed them?
The defence case centres on postpartum psychosis, a rare but severe psychiatric condition that can occur after childbirth.
Clancy's lawyers argue that her mental health deteriorated dramatically after the birth of her youngest child. Her family has described suicidal thoughts, fears about harming her children, sleep problems and significant changes in her behaviour.
The defence also says she was treated with several psychiatric medications and was later admitted to a psychiatric hospital.
Experts called by the defence testified that Clancy was experiencing psychosis when she killed her children. Forensic psychiatrist Phillip Resnick testified that Clancy was experiencing postpartum psychosis and lacked criminal responsibility at the time of the killings. According to his testimony, she believed she was protecting her children rather than harming them.
Another defence witness, forensic psychologist Paul Zeizel, testified that Clancy had described hearing a male voice ordering her to kill the children and then herself.
What does Patrick Clancy say?
Patrick has given a complicated account of his former wife and her mental health.
He testified that Lindsay had struggled with her mental health before the killings. He also said she had previously spoken about suicidal thoughts and fears of harming the children.
But on the day the children died, Patrick said she appeared to be doing much better. They had spent time together with the children and even built a snowman.
He described it as one of her best days.
Patrick has also publicly said that he forgives Lindsay and views her as seriously ill rather than simply evil.
Importantly, Patrick has never been a suspect in the children's deaths.
So why does the prosecution disagree?
Prosecutors argue that Clancy's actions were deliberate and that she understood what she was doing.
They have pointed to evidence about her behaviour before and during the killings and have challenged the defence's claim that she was experiencing psychosis.
A prosecution psychiatrist, Dr. Avram Mack, testified that Clancy suffered from major depression but did not show evidence of psychosis or mania. He said she understood the difference between right and wrong and could control her actions.
The prosecution therefore wants the jury to find that Clancy was criminally responsible for the deaths.
Why is the internet divided?
The trial has attracted significant attention online, with people debating both the evidence and the role of postpartum mental illness in the case.
Some people believe the case exposes serious gaps in the way postpartum mental illness is recognised and treated. Some supporters argue that the trial highlights gaps in how severe postpartum mental illness is recognised and treated. Others argue that discussions about Clancy's mental health risk shifting attention away from the three children who died.
Others argue that discussions about Clancy's mental health risk shifting attention away from the three children who died.
The debate has also taken a darker turn.
Social media users have circulated theories accusing Patrick of involvement, despite no evidence that he killed the children. CNN reported that some online theories focused on details such as his DNA being found on exercise bands. Patrick testified that he removed the bands from the children's bodies when he found them.
The theories have grown partly because viewers are watching selected portions of a long trial online. Gaps in the televised evidence have created space for people to fill in their own explanations.
That does not make those theories evidence.
What does the law say?
Massachusetts has a specific legal test for criminal responsibility.
Under the state's standard, a person is not criminally responsible if, because of a mental disease or defect, they lacked the substantial capacity either to appreciate the criminality or wrongfulness of their conduct or to conform their conduct to the requirements of the law.
In Clancy's case, that means the jury is not simply deciding whether she was mentally unwell.
It must decide whether her mental condition was severe enough at the time of the killings to meet that legal standard.
The prosecution has the burden of proving criminal responsibility under the applicable Massachusetts standard. If Clancy is found criminally responsible and convicted of first-degree murder, she faces life imprisonment without parole.
If she is found not guilty by reason of insanity, that would not simply mean she could walk free. Massachusetts law provides for commitment to a state psychiatric facility, with her continued detention and any potential release governed by the state's legal and psychiatric review process.
Where does the trial stand now?
The prosecution finished presenting its main case on 17 August 2026.
The defence rested on 21 August after presenting witnesses who supported its argument that Clancy was suffering from postpartum psychosis.
Prosecutors then began presenting rebuttal witnesses, including psychiatrist Avram Mack, who challenged the defence's explanation of Clancy's mental state.
Closing arguments are expected to begin this week, after which the jury will consider the evidence and determine whether Clancy was criminally responsible for the deaths.
At the centre of the case is therefore not a dispute over whether the three children died or whether Clancy caused their deaths.
The question is whether, because of her mental state at the time, she had the substantial capacity to understand that her actions were wrong or to control her behaviour.
TL;DR | News At Glance
What happened?
Lindsay Clancy is accused of killing her three children at the family's home in Duxbury, Massachusetts, in January 2023.
Why did she do it?
Her lawyers argue that she was experiencing severe postpartum psychosis and believed she was protecting her children.
What does her husband say?
Patrick Clancy said Lindsay had serious mental health problems and has said he forgives her. He was not accused of killing the children.
What does the prosecution say?
Prosecutors argue that Clancy deliberately killed the children, understood that her actions were wrong and remained capable of controlling her behaviour.
Why is the internet divided?
The case has sparked a debate over postpartum mental illness, maternal mental health and criminal responsibility. Online users have also pushed unproven theories about Patrick.
What happens now?
The jury will decide whether Clancy was criminally responsible for the children's deaths or should be found not guilty by reason of insanity.
