A psychologist testified that Lindsay Clancy was not criminally responsible for killing her three children due to her mental health issues. The psychologist, Paul Zeizel, stated that Clancy did not appreciate the wrongfulness of her actions. Zeizel began treating Clancy at a hospital after the incident and noted that she had a mental disease or defect. He also mentioned that Clancy was suffering from bipolar disorder and postpartum psychosis at the time of the incident.

Further details about the case and Zeizel's testimony are available. The testimony is part of Clancy's murder trial, where the defense is arguing that she should not be held legally responsible for the killings.