Murder in the First (1995)

Henry, a small-time criminal sent to Alcatraz, is caught attempting to escape and as punishment, he's put in solitary confinement. Instead of staying the maximum nineteen days, he is kept alone, in the cold and complete darkness for years, only to emerge a madman and a murderer. It's a rookie lawyer who proves Alcatraz is to blame, and that Henry should not be executed.