James Schappell was allegedly killed by his dementia ward roommate, authorities said.
An 86-year-old man was beaten to death with a piece of furniture wielded by his roommate in a Massachusetts dementia ward, prosecutors said.
James Schappell died from his injuries on Tuesday, Norfolk District Attorney Michael Morrissey announced.
Read: Photo Catches Touching Moment a Cop Walks Hand-in-Hand With Dementia Patient
He had been transported to Boston Medical Center after aides at the Care One nursing center found him badly injured in a sequestered unit for dementia patients, Morrissey said.
Walter Rice Jr., 58, who shared a room with Schappell, was arrested and charged with assault and battery with a dangerous weapon.
Quincy District Court judge Mark Coven declined to arraign Rice and ordered him to undergo a competency hearing at Bridgewater State Hospital.
Read: Unarmed Grandfather With Dementia, 73, Shot Dead by Police Officer
He is scheduled to return to court on Sept. 21.
The killing is under investigation by local and state police.
Watch: Assault of Elderly Dementia Patient by Nursing Home Employee Caught on Video