The Oregon State Police say a Hermiston man died in a single-vehicle accident this past Friday afternoon on Highway 97 in Sherman County. According to the OSP, the accident happened at about 4:16 p.m. near milepost 26. The preliminary investigation indicated a car operated by 29-year-old Nicholas Demos of Hermiston was traveling southbound on Highway 97 when it left the roadway and rolled over. Demos was ejected from the vehicle and pronounced deceased at the scene. The highway was impacted for approximately 1 hour during the on-scene investigation. The OSP says speed and lane usage are suspected as the main contributing factors to the crash.