The other one

One morning, Steward Johnson, suffering from dissociative identity disorder, is suddenly arrested by the police in his home, on suspicion of a triple murder with particular cruelty. Despite the ubiquitous and irrefutable evidence, he has no memory of the incident. Sentenced to death, he ends up in the Polunsky B. Unit prison in El Paso, Texas, where he joins the Aryan Brotherhood. At the same time his brother, Edward, starts a war between two gangs, the Mexican Mafia and the Aryan Brotherhood, which quickly takes a deadly toll. Detective Michael Williams tries to help Steward because, contrary to his earlier belief, he suspects that he may have been framed for the crime by a third party.