at this point, were you able to rule out derrick dorsey? >> absolutely not. had someone setting this up. >> then again, if he had hired someone to kill kim, why was he acting so darn helpful? >> derrick's calling me daily, and obviously there are times i had to call him, you know, to get some information about things at the house, you know. and so, yeah, he's cooperating. he's doing everything, you know, that i'm asking of him. >> finally officers and technicians were done processing the crime scene and derrick could return to the house. >> so the night we go to turn the house back over, i think it was halloween, the 31st. >> they hoped the walls might talk to derrick might reveal something officers had missed. >> part of the turnover back to him was to bring him out to the house, to have him look around, walk us through the whole house, show us anything that maybe was out of place that we missed as investigators and the evidence technicians to say, that's not right. >> as it turned out, the house wasn't just speaking to derrick. it was practically shouting.