Chris Koster
Cass County Prosecuting Attorney

Chris Koster presently serves as Prosecuting Attorney of Cass County, Missouri. He was first elected prosecutor in 1994 and was subsequently re-elected in 1998 and 2002 by wide margins.

As prosecutor, Koster supervises a staff of twenty individuals dedicated to enforcing Missouri’s criminal laws in Cass County. Additionally, his office serves as the civil counsel for all non-criminal matters before the county government.

During his tenure, Koster has supervised litigation in approximately 20,000 cases. He has led investigations into many of Kansas City’s most notorious criminal cases, including the investigation against serial killer John E. Robinson. He has developed extensive trial experience, with 25 jury trial victories including 10 murder trial victories. He has argued and won cases before the Missouri Supreme Court.

Koster is active in his community. He serves on the board of directors of the Missouri Association of Prosecuting Attorneys. He is a member of the Belton-Raymore Rotary Club and the Belton Chamber of Commerce. He has served as a board member of the Hope Haven Women’s Shelter. In 2002, Ingram’s Magazine named Koster “one of Kansas City’s most influential citizens under 40 years old.” In 2004, the Kansas City Business Journal named Koster to its list of Kansas City’s best attorneys.

Prior to becoming prosecuting attorney, Koster practiced law with the Kansas City law firm of Blackwell Sanders from 1993 to 1994. He also served as an Assistant Attorney General for the Office of the Missouri Attorney General from 1991 to 1993.

Koster was born and raised in St. Louis, Missouri, where he attended St. Louis University High School. He received a liberal arts degree from the University of Missouri – Columbia in 1987 and his law degree from University of Missouri School of Law in 1991. Additionally, Chris earned a Masters in Business Administration from Washington University – St. Louis in 2002.




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