>> very quickly. >> sean viehweg, morgan soon discovered, was living in klamath falls, oregon, with ahter. 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. >> then the story begins to unravel. >> yo if you know me you know i'm not some kind of freaky, weird guy. >> haltingly, bit by bit, viehweg admits to one detail after another. confesses that he and russell were alone on a trail together. >> russell said, "let's go for a walk." >> they played a game, he says, squeezing each other to see if they could make themselves pass out. >> i did it to him and he did it to me. >> but the ritual became too rough or too intimate when viehweg claims his young friend suddenly overreacted and pulled a knife. >> and here's this kid you know, trying to kill me with a knife, i mean i just got done choking him, my heart's jumping out of my chest and i grabbed it and threw it and he