A South Dakota teen is dead after crashing their vehicle on Highway 18 Saturday afternoon. The South Dakota Highway Patrol says it happened just after 4 p.m. just east of the intersection of 466th Avenue about six miles east of Davis. The patrol says 19-year-old Courtney Rothschadl of Viborg was driving west on 18 when she lost control of the car and rolled the vehicle. Rothschadl was ejected from the car and was pronounced dead. She was not wearing a seatbelt.