STAR CITY, Ark. (AP) — An Arkansas state prison inmate has been sentenced to 20 additional years for manslaughter in the killing of a fellow prisoner during an outbreak of violence in 2017.

The Arkansas Democrat-Gazette reports that James Walker died in September 2017 from a single punch.

A Lincoln County jury determined Tuesday that Damont Ewells was reckless when he hit the 34-year-old, causing him to fall and crack his head on a concrete floor at the Cummins Unit in Grady.

The 47-year-old Ewells told the court he blacked out but that he does remember confronting Walker, who was his friend.

Ewells was imprisoned in 2007 for drug offenses. He had been eligible for parole in 2036 before Circuit Judge Jodi Dennis imposed the maximum 20-year sentence for manslaughter.