The teen died late Saturday morning during a single-vehicle rollover  accident on 570th Street, about two-miles south of Highway 92. Cass County Sheriff’s Deputy Corey Larsen told KJAN News Oldenkamp was traveling northbound in a 2006 Chevy Monte Carol, when for reasons unknown, he lost control of the car. The vehicle entered the west ditch and rolled twice before coming to rest upright. Oldenkamp was ejected from the vehicle and died at the scene.