A man from Richview was killed in a single-vehicle crash on Saturday night, while traveling on US Route 51, south of Centralia.  According to police, 48-year-old Timothy Johnson was traveling southbound on 51, just south of Baseline Road in Washington County, Preliminary investigations say that Johnson left the roadway to the west for some unknown reason, and struck a driveway and overturned, while coming to a rest on its roof.  Johnson was not wearing a seat belt at the time and was ejected from the vehicle.  He was pronounced dead at the scene.