The murder trial of Lindsay Clancy has taken another dramatic turn as disturbing new testimony sheds light on the weeks and months leading up to the deaths of her three young children.

Clancy, a Massachusetts mother and former labor and delivery nurse, is currently standing trial in Plymouth Superior Court on three counts of first-degree murder in connection with the January 2023 deaths of her children, Cora, 5, Dawson, 3, and infant Callan. Her case has attracted nationwide attention because of the heartbreaking circumstances surrounding the tragedy and the intense debate over her mental state at the time.

But testimony emerging from the courtroom is now revealing details that could become critical to the final outcome.

Medical professionals who treated Clancy before the tragedy have testified about her worsening anxiety, severe problems sleeping, intrusive thoughts, depression and concerns surrounding the medications she was taking.

One psychiatric provider testified that Clancy had expressed persistent suicidal thoughts in the period before the deaths. However, testimony also indicated that she had not disclosed a specific plan to harm herself or her children.

The defense has focused heavily on Clancy’s psychiatric treatment, arguing that she was suffering from severe mental illness, including postpartum psychosis, and that medication changes contributed to her deteriorating condition.