A young Vietnam War veteran was accused of a crime he did not commit. He cooperates in prison life to prove his innocence until a bunch of prisoners attack him and uses his military experience until a female officer gets sexual assault by prisoners triggering his PTSD causing him to stab the prisoner in cold blood violently. The cops didn't stop him as they find out about the situation and were able to gain the officers' respect not until the zombie outbreak occurred. As he tries to escape with the cops as he's about to be bitten the female officer blocked him and got bitten she said that she owes him for saving her and told them to get out as the officers told him not to worry about them. So he left the breached prison and never forget the officers' sacrifice.
