there were no names on it from florida, or nevada, or new mexico, or any of the other places this investigation would eventually lead him-- at least, not yet. coming up, the investigation begins close to home-- with the dead man's on-again, off-again wife. [music playing] and i said, well, is he-- is he hurting you? is he-- is he hitting you? and she said, no, really, he isn't physical. it's just emotional and verbal, but i've hit him a couple times. you don't want to believe the mother of your grandkids would ever be a suspect. josh mankiewicz: but a wife, as a potential person of interest, is just the beginning in this cross-country tale of love gone wrong. when "dateline" continues. to spellbinders, pathfinders, to grand plan designers. to historians, victorians, and all the targaryens.