When suicide prevention expert Lindsay Hayes learned that convicted Cleveland kidnapper and rapist Ariel Castro had hanged himself in his cell night, he wasn’t surprised, reports CBS News. “It was only a matter of time,” said Hayes, the director of the National Center on Institutions and Alternatives and author of the National Study of Jail Suicide. “Someone who had been convicted of such a heinous and despicable crime, who was going to spend the rest of his life in prison – I wasn’t surprised.” The Associated Press reports that Castro, 53, had been taken off suicide watch in June. At the time of his death, he was in a single cell under “protective custody” Suicide watch is much more restrictive. Hayes said inmates deemed suicide risks have their clothing and possessions taken away, wear smocks made of material that is difficult to tear and are usually either under 24-hour observation or being checked every 15 minutes. “You can’t keep someone on suicide watch for the rest of his life,” said Hayes.