sister? >> it's not your fault. she's blamed herself from that moment on. you didn't choose this. people have affairs. millions of people every day. and no one deserves this. >> reporter: tom's parents were stunned by the new direction the investigation was taking. >> reporter: you go from thinking that your son likely died from natural causes to now there's a murder investigation? it just seems like something that wouldn't happen. >> just pilin' the crap right on top of you, right after another. >> reporter: to you. >> it was just, you know, what else are they gonna tell me now? >> reporter: did you call linda? >> no. >> reporter: why did you decide to just let it be with her? >> well, we were so devastated by the news, we didn't know how to deal with her. we didn't know what to think. >> if i called her and i spoke to her, i'm only gettin' one side of the story. my son's not around to -- to tell his side, or anybody. you know, so i figure, "well, if i ask her, i don't know what i'm bein' told." >> reporter: you must've been so angry.