her five-year-old daughter cora, her three-year-old son dawson, and her eight month old son, colin. >> beautiful, beautiful children. well cared for. they were just beautiful. >> all three children found january 25th in the basement of their duxbury massachusetts alma, unconscious as the district attorney exhibiting obvious signs of severe trauma. two died that night. the third, the eight-month-old, died two days later. their mother attempted suicide. she survived. in the voices of first responders, anxiety. >> go to the basement. let's go to the basement. >> dave heith's son, a firefighter, responded that night. >> it still bothering him today. yesterday when it's quiet, that's when you start, you are along with your thoughts and