elise hanlon, scott sherwood's wife. >> on the stand, she recalled a conversation with paul where he e murder. and that he did it alone. >> scott had nothing to do with it. no way scott is getting into trouble. scott had nothing to do with it. >> he told her, i went up with him, i did everything. >> three people in three different rooms tell us the same thing. you may not be able to say you have a fingerprint, or we have dna, but that's pretty damning evidence. >> the last piece of prosecution needed was motive. why would paul want to kill his wife, catherine. ? simple, they said, money. when catherine died paul cashed in on her life insurance policy and homeowners insurance. it all totaled around $700,000. >> the defendant said he would kill catherine and burn up the evidence. and he did just that. >> now it was the defenses turn to attack. jurors would hear more about the checkered pasts of the witnesses at the very heart of the case. >> coming up -- and what a very checkered past some of those witnesses had. >> i think i slept with half the town. >> when "dateline" continues. ♪ it'