A 10-year-old Festus boy was killed while riding as a passenger in an ATV in Ste. Genevieve County Sunday afternoon. According to the Missouri State Highway Patrol, a 12-year-old from Valle Mines was driving a Polaris Ranger southbound on Avon Road and attempted to make a u-turn causing the vehicle to roll over. The Festus boy was pronounced deceased at the scene by first responders. The accident took place at 12:17 Sunday afternoon.