A Buffalo woman was killed and a teenager seriously injured in an accident on Missouri Highway 32 at 3:45 Thursday afternoon, 3 miles east of Halfway. 61-year-old Kathy L. Warner ran off the right side of the roadway, struck a culvert, became airborne, and overturned. A 14-year-old juvenile passenger was taken to Mercy Hospital in Springfield. Neither occupant in the car was wearing a seatbelt.