who killed Al Hanashi?

"Whether or not Al Hanashi died a suicide, the question remains why he was driven to such a desperate measure, or why those in charge of his care failed so miserably to keep him alive. While his death may have been due to the stresses of torture and imprisonment, bringing the prisoner to despair and suicide, there may have been other, more distal causes affecting his situation. - Jeffrey Kaye, Truthout