South Dakota investigators are looking into the death of an inmate at the State Penitentary in Sioux Falls. Dale Wickhurst died Thursday. The 55-year-old Wickherst was serving a seven-year sentence for damaging property. The offense happened in Beadle County. South Dakota’s Department of Corrections says an autopsy will be done to determine what caused Wickherst’s death. The state criminal investigation division will looking into the incident. The Corrections Department says that’s standard procedure when a prison inmate dies.