California authorities are attributing the death of a Napa State Hospital patient who died while being restrained by staff to coronary artery disease and an enlarged heart.
The Napa County Coroner's Office completed an autopsy on 47-year-old William Roebling on Wednesday.
Sheriff's officials say Roebling died two days earlier in a secure ward after attacking another patient. He apparently stopped breathing while being restrained by several staff members following the alleged attack.
He was pronounced dead at the scene.
California workplace regulators have fined the hospital more than $100,000 for safety violations they say were uncovered in their probe of the slaying of 54-year-old Donna Gross, a psychiatric nurse, in October.
Authorities have charged 37-year-old Jess Massey, a patient at the hospital, with the killing. He has pleaded not guilty.