One man was killed early Sunday and the Sparks Police Department says the roommate who shot him is cooperation with their investigation. The shooting happened just after 2:30 a.m. Sunday on 11th Street between Rock Boulevard and Pyramid Way. Police found a 31-year-old man who had been shot and was unconscious. Police say he was pronounced dead at the scene. The 26-year-old man who shot him was at the scene and was released after being interviewed. Police are calling the case a homicide. They say both men lived at the same home and they argued before the shooting. The incident is not gang-related and names are not being released.