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Is it a word or a person or a thing? the clues pointed in so many different direction that is it really was a total mystery. >> there is a concept in the law known as a dying declaration. with those three letters scrawled in her own blood lead to the apprehension of her killer? >> when we come back, investigators dig into that three-letter mystery. >> you have this scrawled in message saying this is my killer. >> absolutely. >> who or who was roc? when written in blood continues. let's be honest:

Turned. >> they're seemed to get along for a while and she was happy, but he turned into not a nice guy. it was creepy. unexplained bruises and i used to tell her what are you doing. he did not deserve her. >> the fights got worse and police were called three separate times to intervene. one time roc allegedly broke down the front door. it was the last straw. karen filed a domestic battery complaint and roc moved out. even a year later roc was harassing her about a roll top desk he left behind. >> she was starting to get scared of him. >> i have a valuable piece of furniture and i want to back...

Might have had with her? the boyfriend-girlfriend? >> absolutely. he had moved on. pa. >> the detectives were ready to move on too. they officially cleared roc. it was a major development. karen's ex-had suddenly gone from being a prime person of interest to a victim himself. victim of the real killer who tried to frame him for the crime and was still out there somewhere. >> whoever killed her did know that somebody named roc is part of the story. >> that's right. but if you think about this, it's not even a smart thing to do. >> roc was right. the pool of suspects had suddenly narrowed to a h...

Wonder if that's what wrote these letters. >> cox bought similar gloves at a hardware store and after several more days of testing, was satisfied that her hunch was correct. >> anna cox had come up with two important findings. the message in blood had likely been written with a gloved hand and scrawled 20 minutes after the on set of the attack on karen. she reported her results on the detective who is had learned another fact about the victim. >> karen was exclusively left-handed and her left hand did not have blood on it. >> not only that, when the autopsy came in, it suggested karen could no...

Given her awful news. she had multiple sclerosis at treat 38 years old. >> to be a young divorced woman with this diagnosis, what do you think that did to her? that's a lot to put on your shoulders. >> right. that really affected her self esteem and frankly may have had an impact on the kind of men that she was attracted to. >> karen came to rely on roc to take her to doctor's appointments and give her injections. when she asked him to move in, her friends and family thought she was asking for trouble. >> you worry is this the way ahead for my sister? >> i think that's true. is it my place to ...