One man was killed and two children have been seriously injured in a car crash in Clark County. Sheriff’s officials say 30-year-old Aaron Dierich was driving a car that hit a guard rail along Highway 29 at the Withee overpass and went into the ditch. Dierich died at the scene Sunday. Two children, ages five and eight, were in booster seats in the back seat at the time of the accident. They were taken to St. Joseph’s Hospital in Marshfield.