wonder if that's what wrote these letters. >> cox bought similar gloves. ana cox had come up with two important findings. the message in blood had likely been written with a gloved hand and had been scrawled at least 20 minutes after the on set attack on karen. she reported to her results to detectives who by then had learned another pertinent fact about their victim. >> karen was exclusively left-handed and karen's left hand did not have blood smeared on it. >> not only that, when the autopsy report came in it suggested karen could not have written anything on either hand. was this a victim going to be able to dip in her own blood and write roc on the wall in. >> no, absolutely not. over 90% of her spinal cord had been damaged by knife wounds.