FORT COLLINS, Colo. -- A man who pleaded guilty to killing college student Lacy Miller denied ever posing as a police officer and pulling people over, according to an interview with police the day before he was arrested.

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See Video Of Police Interview With Jason Clausen

Jason Peder Clausen, 22 (pictured, on the left), is serving a life sentence for abducting Miller, 20, near her home Jan. 18 and killing her. He was accused of posing as a police officer.

Videotapes of his interview Jan. 21 with police were obtained through a public records request.

Clausen did not admit to killing Miller in the tapes, the Coloradoan reported in a story published Thursday.

Det. Jeremy Yonce started the interview by saying Eric Jensen, Clausen's roommate, told police he saw feet in the back seat of Clausen's Ford Expedition.

Clausen said what Jensen saw was actually trash bags filled with clothing. He said he was just kidding around and told Jensen there was a body in the car to see if Jensen would stick by him.

"I asked him for ideas (of where to dispose of the body)," Clausen told Yonce. "To see what he would say."

"He just kept hammering away at me, just because I was tired and stuff like that. 'Tell me what's wrong, tell me what's wrong. You're always keeping stuff from me. What's wrong?' (So I said) I got a dead body," Clausen said.

Clausen said that he didn't get the impression that his roommate took the story about the body seriously.

"If he was dealing with that something of that gravity, if it was real, I would have been a lot more freaked out than he was," Clausen said.

Yonce, who knew Clausen while Clausen was in the Fort Collins police Explorer Scout program, listened as Clausen detailed problems with personal relationships, work and run-ins with the law.

"Everything you can imagine in the past four months that can go wrong has gone wrong," Clausen said. "Everyone I trusted and everyone I turned to, with the exception of my immediate family, has for some reason ... feels the need to screw me over."

Clausen was scheduled to leave for the Army on Jan. 22.

"I'm desperately trying to leave for the military. That's all I'm trying to do," Clausen said.

"I don't know why the timing of this stuff always goes wrong," he said later.

During the interview, Yonce also asked about red and blue lights and sirens found in Clausen's Expedition.

"I need you to be straight with me and tell me how many times you pulled people over," Yonce said to Clausen.

"No, never," Clausen said.

Yonce told Clausen he knew he was lying because a police dispatcher identified him as the man who pulled her over Jan. 5 in a suspicious traffic stop.

Clausen's attorney from previous cases, J.J. Vick, arrived in the middle of the interview.

"We know what happened with Lacy," Yonce said to Clausen.

"With who?" Clausen responded.

"Lacy, the girl who's missing," Yonce said.

Yonce went on to say that by inspecting Clausen's sport utility vehicle and his room, investigators had recovered a long blonde hair, fluids on a tarp that had Miller's DNA, a mattress and Miller's identification card.

The interview ended more than four hours later. Clausen was arrested the next day. Miller's body was found Jan. 26 in a remote area in the Poudre Canyon.

Clausen didn't confess to the crime during the videotaped interview, but he pleaded guilty in exchange for a life sentence without parole. If he went through a trial, he could have been sentenced to death.