A decades-old mystery surrounding a missing Utah teen has been solved.

Utah police have identified the remains of a boy found in Arches National Park near Moab in 1983 as Robby Lynn Peay, 17, who vanished after running away from a youth treatment center in 1982. While the discovery closes a 41-year-old cold case, a homicide investigation is ongoing with Grand County detectives, according to Salt Lake City outlet Fox 13.