The Story of Diane's Mother Killing Her Children

Christie's heart rate spiked every time her mother Diane entered the room. The doctor became even more concerned when Diane told him that she knew that Christie was brain dead and told him to pull the plug. Police had looked at everyone and anyone that could have been involved with the shooting, but none of their leads panned out. Their investigation now became solely focused on Diane. But the question remained, why? What would make a mother kill her children?