>> very quickly. >> sean viehweg, morgan soon discovered, was living in klamath falls, oregon, with ae and daughter. time has not been kind. nor life for him successful. viehweg did serve in the u.s. military. went to the gulf war. but his two previous marriages failed. his dead-end jobs here petered out. and now it's an out of work, paunchy, balding viehweg who agrees to talk to police. >> and then the story begins to unravel. >> haltingly, bit by bit, viehweg admits to one detail after another. confesses that he and russell were alone on a trail together. >> they played a game, he says, squeezing each other to see if they could make themselves pass out. >> but the ritual became too rough or too intimate when viehweg claims his young friend suddenly overreacted and pulled a knife. >> his story of what happened that day amounts to a confession. of murder? make it self-defense. viehweg insists he had to kill russell jordan or risk being killed himself. >> finally, vindication of a sort for gilbert jordan. russell's dad, who'd been telling police for years he thought sean viehweg was a