A California man was sentenced to 11 years in prison on Tuesday in the death of his former roommate, whose body was found hidden inside a wall in 2015.

Randolph Garbutt, 47, pleaded guilty last month to voluntary manslaughter after the remains of Raven Campbell — who had been missing since 2009 — was discovered and “excavated from behind a wall at a residence” in Lomita, a city roughly 25 miles south of Los Angeles.

Campbell died of blunt force trauma, the Los Angeles County District Attorney’s Office said in a news release. Garbutt, officials claimed, used a hammer to kill her.