>> there was blood all over. >> the 6-year-old had two devastating wounds to his chest. they went completely through his body. he was impaled by a large knife. >> darin tried to perform cpr. >> when i blew into his mouth, the first thing that happened was air came out of his chest and blood just sprayed all over me. >> is anybody in the house besides you and the children? >> my husband. he's upstairs. oh, my god. >> darlie routier had also been injured with stab wounds to her neck and arms. >> there's blood everywhere and darlie is bleeding and she is telling darin some men came in here and did this. >> all right, listen, ma'am. you need to let the officers in the front door, okay? >> the first two officers who