A Washington man died in a three-vehicle accident on Sunday morning on Highway 26 in southern Wasco County.  According to the Oregon State Police, a preliminary investigation shows a pickup truck operated by 33-year-old Ryan Ranson of Lake Stevens, Washington was eastbound near milepost 77 when it sideswiped a westbound SUV, then collided with a westbound pickup.  The OSP says Ranson sustained fatal injuries, while those in the other two vehicles were not injured.  The accident occurred at about 11:50 Sunday morning, and Highway 26 was closed for about five-and-a-half hours to conduct the investigation.  The OSP was assisted by the Oregon Department of Transportation, Warm Springs Fire and Rescue, and the Warm Springs Police Department.