A man convicted of killing four people in mid-Missouri ten years ago is scheduled to be executed by lethal injection early Wednesday morning. James Johnson went on a killing spree after an argument with his wife December 8, 1991. Johnson first killed Moniteau County Deputy Les Roark, who had responded to the domestic disturbance call. He then drove to the home of Sheriff Kenny Jones and shot and killed his wife as she hosted a Christmas party. Next, Johnson drove to the home of Deputy Russell Borts and shot and wounded him. He then waited outside the sheriff’s office where area law enforcement officers had gathered where he killed Cooper County Sheriff Charles Smith and Miller County Deputy Sandra Wilson. Attornies for Johnson unsuccessfully argued during trial that Johnson suffered from Post Traumatic Stress Disorder from his years of service in Viet Nam.