Donald Ferdinand Isaak of Steelville, Missouri passed away Tuesday, April 7, 2015 in Chesterfield, Missouri at the age of 85 years, 7 months and 22 days. He was born August 16, 1929 in Overland, Missouri to Nicholas Fred Isaak and Opal Marie Hopkins Isaak. On August 16, 1950 in St. John's, Missouri, he was united in marriage to Betty Lee Hardin and to this union three children were born. Don grew up in Overland, MO and served his country honorably in the U.S. Army in Korea from 1951-1953. Don attended Washington University and completed engineering training at Rankin in 1956. He worked at McDonnell Douglas in St. Louis and retired to Steelville in 1985. Don enjoyed farming and raising cattle and in his spare time liked to fish and hunt. He was an avid St. Louis Cardinals fan and loved to follow the MU Tigers. He will be sadly missed by his wife of almost sixty-five years, Betty Isaak of Steelville, MO; two daughters, Karla Goldammer and husband Dave of Chesterfield, MO and Lisa Davis and husband Tim of Columbia, MO; five grandchildren, Nicholas Davis, Scott Davis, Matthew Goldammer, Kayla Goldammer and Kathleen Goldammer Dye; sister-in-law, Marlene Isaak Slade of Steelville, MO; other relatives and friends. Don was preceded in death by one son, Mark Donald Isaak; and brother Harold "Bud" Isaak. The Family received friends from 5:00 to 8:00 p.m. on Friday, April 10, 2015 at the Britton-Bennett Funeral Home in Steelville, MO. Funeral services were held at 2:00 p.m. on Saturday, April 11, 2015 at the Britton-Bennett Funeral Home in Steelville, MO with Pastor Dennis Conway officiating. Special music of "His Eye Is on the Sparrow" and "In the Garden" was sung by Becky Setzer accompanied on guitar by Steve Setzer. Committal prayer, burial and full military honors by the U.S. Army  were in the Redbud Cemetery at Potosi, MO. Honored to be casket bearers were Dave Goldammer, Matthew Goldammer, Tim Davis, Nicholas Davis, Scott Davis and Ben Dye. The Family was served by the Britton-Bennett Funeral Home of Steelville, MO.