roger reister and his little boy triston had just come home at dinnertime to something no child should ever have to see. i m the one that found her. whenever i walked into the had triston with me, and we walked in. it was tough. it was tough seeing that. reporter: lynn, six months pregnant, had been stabbed to death, her throat slashed. my first instinct was to grab triston and run out of the house. and then i knew i was screaming and yelling. i probably looked like a madman out there. but it was i didn t know what to think. she s pregnant. you need to send somebody there. i can t even take her pulse. he immediately called 911 and brought triston out. triston in his statement says my daddy took me out fast, and, you know, those kind of things. reporter: gonzolo chavarilla was the lead detective. did you think about this poor woman s last moments in this house?