SIOUX FALLS, S.D. (KELO) — A state prison inmate died on June 4, the South Dakota Department of Corrections said. Michael Konshak, 71, died in a hospital. He was an inmate at Mike Durfee State Prison in Springfield. Konshak was serving a sentence for solicitation of a minor in Codington County. How many presidents have visited South Dakota? Konshak is the sixth inmate to die this year. The most recent prior death was in early May. Copyright 2026 Nexstar Media, Inc. All rights reserved.