he came over to see her, found her and was devastated. >> tim permenter's alibi checked out.ice dismissed any clues pointing to a home invasion. after all, karen had been stabbed 16 times, an attack so ferocious, it could only be a crime of passion. now the detectives were desperate to figure out what their biggest clue of all meant, those three letters written in blood. roc. this is a creepy scene. i mean, you got this scrawled in blood message saying this is my killer. i'm now dead, you find this guy. that's what it's suggesting, isn't it? >> absolutely, it's what it's suggesting. just like you would see in a movie. >> detectives soon discovered how those letters on the wall, roc, were, in fact, connected to the victim lying beneath them. roc, it turned out, was a man that spelled trouble for karen in the past. >> roc was an ex-boyfriend karen pannell had problems with previously. >> and whoever and wherever this roc was, he'd just become the prime target of the investigation into her murder. >> okay. well, there it is. that's what she meant to write was roc. they have to f