A Monroe City teen was killed in an accident in Ralls County just before 4:30pm Tuesday. The State Highway Patrol reports a vehicle driven by 79-year-old Joseph Barn of Monroe City failed to yield and was struck by a motorcycle driven by 18-year-old Donald Quigley of Monroe City on US-36 four miles east of Monroe City. Quigley was transported to a Columbia hospital and pronounced dead. Barn suffered minor injuries.