A 19-year-old man faces life in prison with the possibility of release after 25 years for the November 2011 slaying of Jordan Peterson.

Reed J. Marrone, one of three men arrested in connection with Peterson's death, pleaded guilty Thursday in Pima County Superior Court to first-degree murder.

Marrone admitted to Judge Javier Chon-Lopez that the murder was premeditated and intentional.

Marrone's defense attorney, Bobbi Berry, told the judge that Marrone was addicted to Percocet at the time of the murder.

Peterson, 21, was last heard from on Nov. 16 when he called his roommate to say he would be home that night. He was last seen at a Carl's Jr. near Interstate 10 and West Congress Street around 6:30 p.m.

His truck was found in Marana two days later with his keys and cellphone still inside.

Authorities found Peterson's remains the following January in a desert area in Pinal County.

Marrone was arrested in late February 2012 after being connected to an unrelated home invasion. He also pleaded guilty to four armed robbery counts in that case.

Marrone faces between seven and 21 years in prison for each of those charges.

The plea agreement does not stipulate if Marrone will serve his sentences consecutively or concurrently.

Another man tied to Peterson's death, Tyler Nicholas Brown, pleaded guilty to attempted abandonment/concealment of a dead body. He faces between four months and two years in prison.

Both men are scheduled to be sentenced on June 17.

Contact reporter Veronica Cruz at vcruz@azstarnet.com or at 573-4224.