A Shelbina woman is dead following a one-vehicle accident in Shelby County. The accident occurred at 2:40 pm today (Thur.) on Highway 36, a half mile west of Shelbina. According to the Missouri State Highway Patrol, a vehicle driven by 70-year old Donna Dennis of Shelbina was eastbound on Highway 36 when she experienced an unknown medical event and traveled off the right side of the roadway. Dennis’ vehicle ended up striking a tree. Dennis was pronounced dead at the scene. A passenger in Dennis’ vehicle, 22-year old Cheyenne Williams of Moberly suffered minor injuries. According to the patrol, Williams wasn’t wearing a seat belt at the time of the accident.