CENTENNIAL — A man is dead in Colorado after exchanging gunfire with police in residential neighborhood in a south Denver suburb. The Arapahoe County Sheriff's Office says the incident occurred about 10:30 a.m. Saturday in Centennial. No officers were hurt. It says officers were called by someone concerned about a friend's wellbeing. The sheriff's office says when officers arrived they encountered a man leaving in a car who fired at the officers.