The Lindsay Clancy murder trial has reached its central divide: whether the deaths of her three children were the result of deliberate planning or a catastrophic mental-health crisis. With the prosecution finished, the defense is now seeking to explain—not deny—that Clancy caused the killings.

The prosecution’s case, summarized as having rested and handed the courtroom to defense witnesses, portrays Clancy as criminally responsible for the January 2023 deaths of Cora, Dawson and Callan.¹ Prosecutors have argued that she planned the murders before staging a suicide attempt. Her phone searches—including “Can you treat a sociopath?” four days before the killings—could support that interpretation, though the defense has pointed to other searches involving suicide, schizophrenia, hallucinations and intrusive thoughts.

The defense instead centers on postpartum psychosis, bipolar disorder and the effects of multiple medications. Clancy’s attorneys do not dispute that she caused the children’s deaths, but argue that severe illness left her unable to form criminal intent. Her mother, Paula Musgrove, testified that Clancy had disclosed thoughts of harming the children weeks earlier and later appeared paranoid and unable to remember things. “The medication was pretty much just destroying her mind, and it wasn’t her,” Musgrove said.²

That account faces complications in the testimony of psychiatrist Jennifer Tufts, who treated Clancy through 14 telehealth appointments. Tufts said Clancy never appeared psychotic, although she described numbness, insomnia and being close to suicidal feelings. She also testified that Clancy had tried at least 10 medications and was reluctant to take them.

The competing narratives are sharply different but share one grim fact: the case turns less on who caused the deaths than on Clancy’s mental state when they occurred. The jury must weigh emotional courtroom testimony and disturbing digital evidence against the defense’s claim that illness—not conscious planning—drove the killings.