(NEWSER) – Ariel Castro has been found dead in his prison cell just 35 days into his life-plus-1,000-years sentence for keeping three women captive in his home for a decade. The 53-year-old hanged himself, say officials at the Correctional Reception Center in Orient, Ohio. Prison officials found his body about 9:20pm. They tried emergency life-saving measures, but he was pronounced dead at a hospital. Officials say Castro was in protective custody, meaning he was in a cell by himself and was checked every 30 minutes, but he was not on suicide watch, the AP reports.