Karl was born and raised in Hammett. He graduated from Hammett High School and attended Boise Junior College where he played football in 1937. He graduated from the University of Idaho.
Karl proudly served in the U.S. Army in the Pacific Theater in World War II as a First Lieutenant until 1946. One of his proudest achievements was attending Officer Training School in Australia.
Karl was a member of the Idaho Legislature and served as Assistant Minority Leader. He was appointed and served on the Idaho Permanent Building Authority and was the Chairman for a number of years.
He was a 69-year member of Masonic Oriental Lodge #60 and also a member of the El Korah Shrine, the Elks Lodge B.P.O.E, Rotary and the Round Bellies. He enjoyed golfing, spending winters in Yuma, Arizona, and watching BSU football!
Karl is survived by his wife, Sheila Koch; his daughter, Karen and her husband Dan John of Boise; his son, Karl Jr. and his wife Jody Koch of Yuma; his grandchildren: Steve John; Ben and his wife Heidi John; Lindsey and her husband, Josh Hunter; Haley Koch; Ashley and her husband Victor Clifton; and eight great-grandchildren. He was preceded in death by his parents; his wife, Arlene; his brother, Ferd Koch; stepson Richard McFarland and his great-grandson, Braden John.
The family requests that memorials be made to the Shriners Hospitals for Children, Fairfax Road at Virginia Street, Salt Lake City, UT 84103.