a mystery dna that threatens to overthrow the entire case against steve democker. >> what we do know teven democker. >> maureen maher is with us from chicago this morning. good morning maureen. >> good morning, anthony. >> maureen, if steve democker's dna is not what's under carol kennedy's fingernails, then why is he under arrest? >> well it really had a lot to do with the divorce, anthony. it was a pretty contentious divorce. it had only been settled for about six weeks at the time that she was murdered. so i think the cops have always said that as they looked at a very short list of suspects, the people in her world, he was really the only one they felt had a motive. >> he was the serial philanderer but that's not exactly motive. >> it's not but 17 is the number that carol counted, including the midwife that she was using while she was pregnant with her first child. so the prosecution always said it may not be the motive for murder to say that she was a serial philanderer but it certainly speaks to character. >> you can see maureen's full report "end of the trail" tonight on a spec