Lindsay Clancy's family have testified at her murder trial in Massachusetts that they were "very concerned" about her mental health in the months before she killed her three young children. The case has drawn intense public attention, with Clancy's defence resting on an insanity plea, arguing she was not criminally responsible due to the psychiatric effects of medication she was taking at the time.

Family members, including Clancy's mother and sister, gave evidence describing warning signs observed before the killings. Her defence team has pointed to 13 psychiatric drugs as central to their insanity argument, while prosecutors bear the burden of disproving that defence. The trial has become a major talking point online, with commentators and amateur investigators closely following proceedings, and Clancy's parents have separately received substantial public donations exceeding $830,000.