An autopsy concludes that a 21-year-old University of Idaho student found shot to death was a homicide victim, Moscow police said Monday.

The Latah County coroner ruled the death of David Robert Boss a homicide, Assistant Police Chief David Duke told a news conference.

Boss, of Boise, was found dead early Saturday in the kitchen of his apartment near campus. He had been shot twice in the head, police said. There was no evidence of forced entry into the apartment.

Duke said a weapon has not been found.

Boss was last seen alive about 8:30 p.m. Friday, and was thought to have died between midnight and 12:30 a.m. Saturday, based on reports of upstairs neighbors who said they heard a noise about that time, Duke said.

Boss' roommate found him on the floor about 1:45 a.m. and called for help, but medical personnel declared Boss dead at the scene, Duke said.

The roommate, also a UI student, is not considered a suspect, police said.

Boss, a history major, was to graduate in May.