two years after diane kyne was murdered in her own bed, her son, kevin, stood trial for killing her. man who'd been under intense suspicion, came to the courthouse every day, still feeling the loss of his wife. >> she was everything i'd ever dreamed of in a lady. we were going to spend the rest of our lives together. >> sheriff's office. >> reporter: in this unusual case of dueling 911 calls and conflicting murder accounts, the prosecutor was confident that blood evidence would sink the son's story and fully support the husband's. >> who was your best witness? >> i think probably anna cox was, really. >> reporter: anna cox, a blood-stain expert, testified that kevin's blood was not only on his mother but also on her bed cover. >> if he says he wasn't in the room, does your scientific finding deny that premise? >> yes. >> there's no question in your mind. science tells you he was in that room. >> yes. you had to be right next to the comforter. >> reporter: to the prosecutor, it was a home run, confirming bill kyne's story -- that he opened the door and saw kevin straddling the bed on t