WARREN, Maine (AP) — State police detectives say the death of a Maine State Prison inmate this spring is now being treated as a homicide.

Officials say 64-year-old Sheldon Weinstein of New Hartford, N.Y., died on April 24 from injuries he suffered at the prison in Warren. He had been transferred from the Maine Correctional Center in Windham eight days before his death.

Weinstein was serving time for gross sexual assault of a child in Berwick.

Maine Public Safety Department spokesman Steve McCausland says additional tests were required after the autopsy on April 26. He said the state medical examiner’s office ruled Wednesday the case a homicide. The cause of death officially is “blunt force trauma.”