she was just 25 when she was killed. now all these years later when christie fleming would have been approaching middle age, her family got astonishing news. the long stalled hunt for her killer was on again. >> i didn't want to get my hopes up, but i thought, wow! this is just incredible. >> but there was still a potentially fatal weakness in the case. dna certainly put art gutierrez, christie's former boyfriend, in her condo, and her compulsion for neatness strongly suggested art's visit occurred just before the murder. but that by itself didn't prove he killed her. one thing that could help persuade a jury that gutierrez was, indeed the killer, and that was a suspected lie he had repeated to detective davis. the last time he saw christie, he had said, was about two to three months before her murder and never once after that. trouble was, none of that was on tape.