jeff bennett: turn left. walker house could be made in less than 45 minutes. jeff bennett: and so this is the walkers' house. this is where rodney would have pulled in into this driveway. josh mankiewicz (voiceover): they wondered why rodney hadn't either gone straight to a police station or even used a phone at the bowling alley to try to call for help. josh mankiewicz (voiceover): carla's siblings, who had always thought rodney was innocent, told detectives even they were bothered by something back when rodney came to their door that awful night. as i got older, i realized that cut on rodney's cheek, it looked like it was not dry, but coagulating. does that make sense? which made you doubt his story. i had questions. and it all came back to the timeline. josh mankiewicz (voiceover): and remember what rodney said. oh yes. oh yes. >> i mean that was they josh mankiewicz: he says to the walkers, they took carla. then he describes only one person. correct. josh mankiewicz (voiceover): and there was something el