In 1987, 21-year-old Paul Wright entered a maximum-security prison in Washington state for first-degree murder. Wright, then a military police officer, was incarcerated after he attempted to rob a cocaine dealer by the name of Curtis Smith. During the hold-up, Smith pulled his own gun, and Wright shot first. Wright unsuccessfully claimed self-defense in court and spent the next 17 years in prison. He was released in 2003. More here.