there is absolutely no doubt in my mind that you're involved in the disappearance of john altinger.n my mind at all, mark. >> why? >> now i'm going to start with the hammering him with what i know. the problem is, i know very little. >> reporter: but now that it was perfectly clear to mark twitchell that he was a suspect in a disappearance and maybe a murder, his easy camaraderie seemed to shrivel. his eyes glazed with something that looked like fear. was he truly innocent? or was something else going on, something more in keeping with his role as a story teller? >> why can't you give me your version of events that night? >> because i'm scared. >> reporter: once as the night dragged on twitchell mumbled something about reality seeming more like some sort of fantasy. >> i just feel like i'm in the [ muted ] twilight zone right now. >> reporter: in the face of all of detective clark's accusations mark twitchell never waivered. for nearly four hours he answered clark's questions always polite, apparently helpful. did not so much as ask for a lawyer. so by the end of the night -- >> i g

location of john altinger's remains. was one block south of his parents' house in that alley. >> reporter: this is the alley behind the twitchell home. it matched perfectly r with the description from "sk conf anons" and in fact this area had been searched by police a year and a half earlier. >> they actually pulled all these sewers, all the covers. pulled them off. they had crews go down, search each one. they found nothing. they did this whole block in this area here and sent cameras down the line where they go doe the lines and snake them down and having a look. >> they found nothing. >> nothing. >> reporter: where did they stop? >> they stopped about where you and i are standing right here on 130th avenue. >> reporter: so a year and a half later, where did you find the body? >> right down there. five telephone poles down on the left-hand side of this alley a half block from where we >> reporter: this was johnny altingero tomb. >> you could see a little piece of torso and pelvis. >> reporter: probably thought it uld all get washed away. >> i think he thought it ould just deteriorate to