he also claimed he found christina's body several hours before todd hale did but he got scared is and ran home instead of calling police. he insisted, however, he wasn't the killer. >> his reason for not calling 911 was because he was a black man and he would be framed for the murder. >> it was estimated she was murdered between 9:00 p.m. and 3:00 a.m. robinson was alone with his children during this time. >> carlos' wife was gone on the night this murder occurred. she was gone to visit a relative in a neighboring city. >> but investigators needed proof that carlos robinson was the killer after all and not just a neighbor who found her body and hadn't reported the crime. >> people often look for somebody that has a motive, and what we were trying to prove to the jury is that a person who barely knew the victim for four days had killed her and that the ex-boyfriend that was abusive to her didn't. >> then investigators discovered either another piece of evidence or a complication. in looking at the crime scene evidence, scientists noticed something in the hamburger buns. one of them was