report castro committed suicide hanging himself in the prison cell. they found him 9:20 p.m. on tuesday. the question from many is how could it happen? castro was separated from the prisonen population and supposedly under pro-ektective custody checked every half hour. castro's 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 an an investigation is underway. castro's mother and sister last visited him ten days ago and noticed a worrying change. the clear signs of depression. >> his body language, tone of voice, his conversation, he wasn't as conversational. >> reporter: a missed warning,