A White Swan man was killed Wednesday afternoon in a one-vehicle accident on Highway 141 in Klickitat County.  Sheriff Bob Songer says a pickup driven by 31-year-old Samuel Smartlovit of White Swan was southbound at milepost five at around 2:15 p.m. Wednesday when the truck failed to negotiate a curve, went off the road, hit a rock and two trees, then rolled over on its side.  Smartlovit died in the accident.  Songer says two passengers in the pickup suffered non-life threatening injuries.