Trial for Lindsay Clancy, the Massachusetts mother accused of killing her three children overview
Lindsay Clancy case: where the trial stands
As of August 25, 2026, Lindsay Clancy’s trial in Plymouth Superior Court is nearing its conclusion. She is charged with three counts of first-degree murder for the January 24, 2023 deaths of her children: Cora, 5; Dawson, 3; and Callan, 8 months. The defense does not dispute that Clancy caused the deaths; the central question is whether she was legally responsible for her actions because of severe mental illness.
Clancy has pleaded not guilty by reason of lack of criminal responsibility, essentially an insanity defense. Her lawyers argue that she was suffering from postpartum psychosis, bipolar disorder, severe depression, sleep deprivation, and effects from psychiatric medications, and that she was experiencing psychosis and command hallucinations when she killed the children.
The prosecution’s theory
Prosecutors acknowledge that Clancy had serious mental-health problems but argue that she nevertheless remained criminally responsible.
Their case includes evidence that:
- She allegedly planned the killings around the time her husband would be away.
- She used exercise bands to strangle the children.
- Prosecutors contend she understood what she was doing and knew it was wrong.
- Their psychiatric experts have testified that she suffered from significant depression and other problems but was not experiencing the kind of psychosis that would eliminate criminal responsibility.
A particularly important recent prosecution witness, forensic psychologist Dr. Kirk Heilbrun, testified on August 24 that he did not believe Clancy was experiencing acute psychosis. He instead theorized that she believed her children would suffer if she died by suicide and acted to prevent that suffering.
The defense’s theory
The defense has presented experts who reached almost the opposite conclusion.
Dr. Phillip Resnick, a prominent forensic psychiatrist, testified that Clancy was experiencing postpartum psychosis, including delusions and command hallucinations, and was incapable of appreciating the wrongfulness of what she was doing. Another defense expert, psychologist Paul Zeizel, similarly testified that she could not comprehend that her actions were wrong.
So the trial has effectively become a battle between two competing explanations:
Prosecution: severely mentally ill, but still aware and in control → criminally responsible.
Defense: severely psychotic and detached from reality → not criminally responsible.
What could happen?
There are several possibilities, but two are particularly important.
- Guilty of first-degree murder
This is the prosecution’s desired outcome. A conviction on the first-degree murder charges carries life imprisonment without the possibility of parole in Massachusetts.
Given that the defense acknowledges the killings, the major fight isn’t really over who did it. It’s over whether the Commonwealth can establish that Clancy was legally responsible despite her mental condition.
- Not guilty by reason of insanity / lack of criminal responsibility
This would not mean that Clancy simply walks out of court.
If the jury finds that she was not criminally responsible because of mental illness, she would be committed to a state psychiatric facility rather than released into the community. Her continued confinement would subsequently be subject to legal review.
This is an important distinction: an insanity acquittal is not the same thing as an ordinary acquittal.
- A lesser finding
There are also potential legal outcomes involving lesser offenses or different findings concerning individual counts, depending on the judge’s instructions and what the jury concludes. But because the prosecution is pursuing three first-degree murder charges and the defense is primarily contesting criminal responsibility, the central question appears to be responsible vs. not criminally responsible, rather than simply whether Clancy committed the acts.
What I think will decide the case
The expert psychiatric testimony is probably the single most important part of this trial.
The jury has heard experts who say essentially:
She was profoundly psychotic and couldn’t understand what she was doing.
versus:
She was mentally ill, but she understood what she was doing and could distinguish right from wrong.
That distinction is critical under Massachusetts law.
The prosecution appears to have gained some momentum with its rebuttal testimony from Dr. Heilbrun, particularly his rejection of Clancy’s account of hearing a commanding voice. But the defense has substantial expert testimony supporting postpartum psychosis, and the jury has heard extensive evidence about her deteriorating mental state before the killings.
My assessment: this is unusually difficult to predict because both sides largely agree on the physical events. The verdict is going to turn on which psychiatric narrative the jury finds more credible and, crucially, whether the prosecution has proved beyond a reasonable doubt that Clancy remained criminally responsible.
The trial is currently in its final stretch, with rebuttal testimony wrapping up and closing arguments expected shortly.
