Ariel Castro, who was sentenced to life plus 1,000 years for kidnapping, raping and holding captive three women, was found hanging in his prison cell Tuesday night, according to CNN.
Officials found Castro, 52, hanging in his cell at the Correctional Reception Center in Orient, Ohio, at about 9:20 p.m., the state’s Department of Corrections said.
Prison medical staff tried to revive him but failed. Castro was taken to the Ohio State University Wexner Medical Center where he was pronounced dead at 10:52 p.m., according to CNN.
Castro was not a part of the general prison population, officials said.
“He was housed in protective custody, which means he was in a cell by himself and rounds are required every 30 minutes at staggered intervals,” JoEllen Smith of the corrections department told CNN in a statement.
“A thorough review of this incident is underway,” she added.