smoking gun or even a plausible motivation for murder. >> in this case, there are many reasonable doubts. >> could anyone say with absolute certainty that she always wore her wedding ring? that she never went out in public with her retainer? the picture of the defense portrayed was of a david pietz open and honest with detectives right from the start. a husband hoping the police would locate his wife. detective kathleen decker took the stand. >> when you first saw david at his residence, i believe you described him as very anxious and upset. >> yes. >> the defense willingly conceded that david pietz was a crummy husband. but skirt-chasing didn't give him a motive for murder. >> dave pietz isn't the first guy to step out on his spouse. all of you, certainly, know of people that have done that. have they killed their wives or husbands or anything like that? >> and, the defense countered, that if anyone had secrets to hide, it wasn't dave.