The murder trial of Lindsay Clancy, who is accused of killing her three young children in Duxbury, Massachusetts, in 2023, has become a central point of contention over her mental state. Clancy, 36, does not dispute the act of killing her children—Cora, five, Dawson, three, and eight-month-old Callan—but has pleaded not guilty by reason of insanity, asserting she was suffering from severe postpartum mental illness.
The trial's proceedings have focused on competing psychiatric assessments. On one side, defense witnesses have argued that Clancy was experiencing such profound postpartum mental illness that she was unable to control her actions or comprehend the gravity of her deeds. On the other, prosecution experts have presented opposing views, maintaining that she was not psychotic and should be held criminally responsible.
Defense Testimony
Dr. Philip Resnick, a forensic psychiatrist specializing in postpartum psychiatric disorders, testified for the defense. He stated that Clancy suffered from bipolar II disorder with severe depression, with symptoms emerging within three months of her youngest child's birth. Dr. Resnick asserted that on the day of the murders, Clancy was experiencing postpartum onset and was "clearly" psychotic. He described her state as feeling "taken over by an external force," comparing it to being a "puppet" controlled by someone else.
Prosecution Rebuttal
In rebuttal, the prosecution called Dr. Avra Mack, a forensic psychologist who interviewed Clancy twice in April 2026 and reviewed her medical records. Dr. Mack diagnosed Clancy with a major depressive episode but contended that her illness was not postpartum in origin and found no evidence of psychosis. Despite a rigorous cross-examination by defense attorney Kevin Reddington regarding Clancy's medical history, Dr. Mack maintained his assessment that Clancy was not psychotic.
Further challenging the defense's claims, forensic psychologist Dr. Kirk Heilbrun also interviewed Clancy. He found her to be severely depressed and suicidal but not psychotic. Dr. Heilbrun pointed to Clancy's reported experience of hearing a male voice for only 18 minutes as evidence against psychosis, describing such a brief auditory hallucination as highly unusual for someone in a psychotic state. This testimony revealed that the killings of the three children took approximately 18 minutes.
The case continues to hinge on the differing interpretations of Clancy's mental state at the time of the tragedy, with legal experts and the jury tasked with determining her criminal responsibility.