Prosecutors said Monday that William McDougall became angry with 94-year-old Manh Van Nguyen, who was singing in their room in Vietnamese at the Palm Terrace Health Care Center in Laguna Woods.
McDougall is accused of taking a metal rod from the closet and hitting Nguyen multiple times on the head. Nguyen died at a hospital.
McDougall faces 25 years to life in state prison if convicted of the Oct. 1 attack.
He is scheduled to be arraigned Tuesday in Santa Ana.
