he hung himself in the prison cell, they found him at 9:20 p.m. tuesday. the question for many is how could it happen? castro was separated from the prison pollation and supposedly under protective custody checked every half hour. his family is shocked. they don't have suspicions but do have questions. >> the family has raised that question. it doesn't feel right. there's no note. we don't know that he wrote a suicide note. >> reporter: authorities aren't giving details and an investigation is underway. his mother and sister last visited him ten days ago and the clear signs of depression. >> his body language, tone of voice, his conversation, he wasn't as conversational. >> reporter: a missed warning? perhaps. good riddens say most on the