A review is underway after Ariel Castro was found hanged in his Ohio prison cell late on Tuesday, officials said.
Castro had been incarcerated since August 5 at the Correctional Reception Center, a prison processing facility outside Columbus, the state capital, about 150 miles southeast of Cleveland.
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.
A thorough review of this incident is underway.
More top news
A team of detectives and specialists is set to begin a painstaking excavation of the area where Ben is thought to have gone missing in 1991.
The foreign secretary's suggestion last week's bombing of an aid convoy might constitute a war crime prompted an angry response from Moscow.
Goals from Charlie Austin, Dusan Tadic and James Ward-Prowse consigned Slaven Bilic's men to their fourth straight Premier League loss.