Expert witnesses for the prosecution testified Tuesday in the Lindsay Clancy murder trial, challenging the defense's claim that she suffered from postpartum psychosis when she killed her three children in January 2023. Forensic psychiatrist Gregory Saathoff, expected to be the final witness before closing arguments Thursday, cited interviews with Clancy, 36, suggesting her accounts were inconsistent and questioning whether she experienced psychosis. Clancy strangled Cora, 5, Dawson, 3, and Callan, 8 months, at their Duxbury, Mass., home but pleaded not guilty by reason of insanity.

Psychologist Kirk Heilbrun testified the killings occurred eight months postpartum, casting doubt on a psychosis diagnosis. He characterized the acts as "altruistic filicide" — killing to prevent perceived suffering — before her suicide attempt. Heilbrun stated Clancy's intrusive thoughts were her own, not auditory hallucinations.

Defense attorney Kevin Reddington pressed Heilbrun on his experience with postpartum psychosis and highlighted symptoms consistent with postpartum depression. Reddington is expected to cross-examine Saathoff Wednesday. Judge William Sullivan presides in Plymouth, Mass. Clancy faces life without parole if convicted; if found not guilty by reason of insanity, she faces indefinite commitment to a secure psychiatric institution. Patrick Clancy, her then-husband, called her shortly before the killings.