Ariel Castro, sentenced to life in prison for the decade-long kidnapping, rape and beatings of three Cleveland women he held captive, was found hanged in his prison cell last night. Castro was in protective custody and isolated from other prisoners. I'm not sure how something like this happens. I'm guessing that someone knew he was doing it and just decided to let him and then "found" him when it was too late. They might have been thinking they were doing the world a favor, but the thing is that the three women above might feel like there was no justice and that he escaped by getting to kill himself.
Source:
http://www.crazydaysandnights.net/2013/09/ariel-castro-found-dead-in-his-prison.html