debbie layton-tholl she needed support from someone, anyone. he felt more alienated from family and friends, and more threatened by the police, the only person in her life that was willing to be there for her was john diamond. michelle theer (on recording): i knew that i was depressed, and i was getting more and more depressed. and i think i went to john for comfort. keith morrison: in fact, just a few weeks after marty's murder, michelle and john drove to florida for a long weekend. michelle wanted to see a former professor for grief counseling, she said later, while diamond stayed with his sister, debbie. debbie dvorak: he acted as if nothing was wrong. because he knows he didn't have anything to do with it. he didn't shoot him. keith morrison: so who did kill captain frank martin theer? was it possible john diamond actually executed his romantic rival? he may have had a motive. police were very suspicious. but the physical evidence was, frankly, rather weak. so detectives kept digging in the arcane world of phone records-- boring, but sometim