Rollover Mon Evening On Slim Buttes Road Claims 1 Life Posted by John Axtell Date: July 28, 2020 5 Views DAWES CO FATAL…….JULY 28 Dawes County authorities say one Pine Ridge Reservation man was killed and another hospitalized shortly after 7:00 Monday evening in a one-vehicle rollover accident on Slim Buttes Road northeast of Chadron. County Attorney/Coroner Vance Haug says 67-year old Mark Goings of Pine Ridge, the driver was pronounced dead at the scene. Haug says the initial investigation by the Dawes County Sheriff’s Office shows that Goings lost control of the vehicle and it rolled. His nephew and passenger, 44-year old Tom Goings, was flown by helicopter ambulance to a hospital in Rapid City for treatment of his injuries. The cause of the accident remains under investigation, but Haug says the preliminary report indicates the accident was caused by excessive speed.