suspicion fell quickly on marc's dad, jack despain. michelle'sbout it when she called to tell a relative that marc was dead. >> somebody's murdered marc. and he was like oh, my god. he said, have they found jack despain? >> he thought right away it was jack. >> mm-hmm. >> because anyone close to jack and his family knew that a poison far more potent than money had come between father and son. >> i never saw it coming. i don't think marc ever saw it coming. >> it began, said michelle, when her 13-year-old daughter told them an ugly story. that her grandpa jack asked her to take nude photos of herself on his phone. marc called a family meeting. >> marc told his dad there's a problem, we want to help you. you know, we're not here to point fingers at you or judge you. >> jack swore he did nothing wrong. marc called in the police. tana, jack's wife of more than 30 years, left him, moved in with marc and michelle. >> how do you prepare for a thing like that? >> you don't. you don't prepare. >> what is that like? >> you just -- your mind just is in over