Testimony ended Wednesday in the triple-murder trial of Lindsay Clancy, with closing arguements expected Thursday. File Photo by Justin Lane/EPA-EFE

Aug. 26 (UPI) -- Testimony ended Wednesday in Lindsay Clancy's triple-murder trial, with closing arguments set to begin Thursday.

Clancy, 36, is charged with three counts of first-degree murder in the killings of her three children, ages 5, 3 and 8 months, at their Duxbury, Mass., home in January 2023. She pleaded not guilty.

The defense has argued that Clancy should not be held criminally responsible because of extreme mental health issues, including postpartum psychosis, while prosecutors say she deliberately killed the children. A panel of 12 jurors is expected to start deliberations after closing arguments.

An FBI psychiatrist, Dr. Gregory Saathoff, was the final witness Wednesday. He said Clancy could still appreciate right from wrong when she killed the children and noted her planning for it, CNN reported. Clancy sent her husband out for takeout before the killings and then attempted to take her own life, cutting her wrists and neck and jumping out a second-floor window. She was paralyzed by the fall.