when you were having sex with caroline sauerby in your home. >> when "dateline" continues.infection can take days. relieving the itch... can happen instantly. vagisil max strength anti-itch wipes relieve itch and odor instantly as they cleanse. so why wait to feel comfortable? trust vagisil. the number one wipe for itch. >> the truth, the whole truth and nothing but the truth. >> reporter: it was riveting almost five years of silence about his wife's murder. broken here in this courtroom. >> i loved cassidy. i loved michelle. >> and then he want to murder his wife. >> now prosecutor becky holk began pulling apart a story she heard for the first time. were you working on your marriage when you were having sex with caroline sauerby in your home less than two weeks before your wife was murdmurdered? >> no ma'am that was not the way to work on a marriage. that was detrimental. >> were you working on your marriage when you called michelle? >> michelle and i confided a lot in each other. we talked about my issues with my wife. she talked about herrer use errish issues with her hu