The South Dakota Highway Patrol says a 21-year old man was killed Wednesday night in a one-vehicle crash eight miles south of Buffalo. The Patrol says the man was driving a Dodge Ram pickup north of US Highway 85 when the pickup went into the east ditch, came back onto the road, went back into the ditch and rolled. The Patrol says the driver was not wearing a seat belt and was ejected from the vehicle. He was take to Belle Fourche and then to the Spearfish hospital where he was pronounced dead. The man's name is not being released until his family can be notified.