Sac County

Sac County in Iowa

Cold Cases in Sac County, Iowa



Mark Koster

Mark Koster

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 declared dead by accidental or other violent means on Oct. 10, 2011. His remains were discovered buried in the basement of his former Sac City home on November 5, 2012. On April 3, 2015, a Boone County jury found John David Green guilty of second-degree murder in Koster’s death.

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