MEDFORD — A man on parole after being convicted eight years ago of attempted murder has been accused of killing a Medford acquaintance over the weekend, police said.

“Based on our investigation so far, it appears to be an unprovoked attack,” Lt. Mike Budreau told the Medford Mail Tribune on Monday.

The suspect was identified as 29-year-old Travis Donald Asbill.

He was booked on a murder charge, with bail set at $1 million, after officers traced him Sunday to a home in nearby Eagle Point and surrounded it. He came out, and officers arrested him. Calls to reach a lawyer for Asbill were not immediately returned.

The victim was 54-year-old Donald William Mack, who died Sunday in a hospital of head injuries suffered at his Medford apartment.

The two knew each other, but police said they didn’t have details of the relationship.

Police are looking for other people who were in the apartment at the time of the assault, Budreau said. Police were called after noon.

“By the time we got there, the apartment was essentially empty except for the victim,” Budreau said.

Police said they had what they believed to be the weapon but wouldn’t say what it was.

Records show Asbill pleaded guilty in 2004 to an attempted murder charge, the Mail Tribune said.

He was accused of stabbing and shooting a man sleeping in a car at a trailhead in what lawyers described at the time as a methamphetamine-induced psychosis compounded by a lack of sleep.

Asbill knew the man, Ronald Ragsdale, who lived in the car, police said. Detectives said Asbill shot Ragsdale in the ear and the chest. Ragsdale fled into a wooded area, fell and broke his arm. Asbill caught up, the detectives said, stabbed Ragsdale, hitting his lung and liver, and then ran off.

Police said a newspaper delivery van driver found Ragsdale in a ditch and called for help, saving his life.

Asbill served more than seven years in prison.