>> if was a kill or be killed situation. >> eventually todd got to his feet. he prepared a bottle for crying alex, he said. and he worried. >> and i just started just pacing around the house just saying, "god, i just killed their mother." >> by-and-by, ariel and eva woke up. todd kept them out of the room where their mom lay dead. then, he said, he cleaned up the house as well as he could. and at 10:26 am, 7 hours after rachel died, he phoned a lawyer friend and asked him to inform the authorities. >> tell me exactly what you heard from your neighbor. >> what i'm willing to tell you is that i'm an attorney. i received a call notifying me of the situation. >> about the same time, 10:30 am, todd took his children to the neighbor's house. >> i said, "there's been -- " i didn't tell them rachel was dead. i said, "we have a very serious situation across the street. can you please watch the kids." >> murder investigations are of course based on more than just witness statements. the csi team rushed over to todd and rachel's house and assistant d.a., lisette suder, joined them as they searched and documented the interior of a house that was strangely chaotic. >> what did it look like?