explained that she was a friend of brenna and russel douglas. >> peggy douglas told the detectives she'deen visiting friends over the holidays and explained that she had simply contacted russel in order to pass along a present for brenna. >> she answered all of my questions to my satisfaction. there was nothing about that phone call that made me include her in the suspect list. >> but then again, the detective's suspect list was essentially a blank page. 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. >> the investigation begins close to home with a dead man's on-again, off-again wife. coming up. >> and i said is he hurting you? 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 of times. you don't want to believe the mother of your grandkids would ever be a suspect. >> but a wife as a potential person of interest is just the beginning in this cross-country tale of love gone wrong. when "a gathering storm" continue