Closing arguments are set to begin in the murder trial of Lindsay Clancy, the Massachusetts mother accused of strangling her three young children in 2023. Clancy has pleaded not guilty by reason of lack of criminal responsibility, with her lawyers arguing she was experiencing postpartum psychosis when she killed the children. Prosecutors say Clancy planned the killings and understood her actions were wrong. Testimony concluded in the trial’s fifth week. A prosecution expert testified that Clancy’s actions showed she remained in control. The defense highlighted her repeated efforts to seek mental health treatment before the killings.