LAKEWOOD, Colo. >> Authorities say an 87-year-old Alzheimer’s patient faces a homicide charge after the deadly beating of a fellow resident at an assisted living facility in suburban Denver.

Prosecutors said Tuesday that Homer Castor also was arrested for crimes against an at-risk adult after the Saturday assault on 76-year-old Gerald Propp in the room they shared. Propp died late Monday.

Police reports show officers were called by staff members who heard yelling and screaming coming from one of the rooms. Officers say they found Propp lying injured in bed and Castor walking away from him.

The report says Castor told officers he thought Propp had tried to beat him up in the middle of the night. A judge on Monday ordered Castor’s mental competency evaluated.

No attorney who could comment on the allegations was listed for Castor in court records.