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>> no, absolutely not. over 90% of her spinal cord were damaged by the knife wounds. >> she was incapacitated. >> it wasn't her. she didn't write that. >> the evidence was overwhelming. karen pan them did not write the letters roc in blood. it was a huge turning.in the case and the best news possible for the ex-boyfriend roc herpick. >> think confirmed 100% she could not have done that. she couldn't have done it. she would have been physically incapable of doing that and it certainly wasn't me. i mean, why would you write your own name on the wall? >> police agree, implicating yourself in a mu...

Looking at her ex-boyfriend roc, his name was scrawled in blood at the crime scene. he insisted he didn't kill her. was there more to the bloody clue than met the eye? forensic specialist anna cox was trying to unlock what her naked eyes could not see. when she did, her discovery would send the investigation in a completely different direction. here is dennis murphy with written in blood. >> the handwriting was on the wall and forensic specialist anna cox was intent on breaking down the three letters in blood, roc. you would spend hours looking at these letters? >> i did. >> you actually cut t...

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 follow that lead, off they go. >> to find roc? >> to find roc. >> coming up, mission accomplished. find him, they do. but what would they find next? >> i'm looking at murder, somebody's talking to me about a murder. >> when "dateline" continues. murder >> when "dateline" continues show your gut some love.

>> bubbly surface. >> knobing grippy surface. i remember thinking, wow, i wonder if that's what wrote these letters. >> cox bought similar gloves at a hardware store. after several more days of testing was satisfied that her hunch was correct. anna cox came one two important findings. the message in blood had likely been written with a gloved hand and it had been scrawled at least 20 minutes after the onset of the attack on karen. she reported her results to the detectives, that learned a fact about the victim. >> karen was exclusively left handed and her left hand did not have blood smear on ...