Cold Cases in Sac County, Iowa     Mark E. Koster — SOLVED 58 YOA 610 N. 5th St. Sac City, Iowa Sac County Went Missing: July 4, 2009 Declared Deceased: October 10, 2011 Remains Discovered: November 5, 2012  Mark Koster was reported missing to the Sac City (IA) Police Department July 4, 2009, and legally […]