Donald David Kaelin, age 82, passed away on Monday, February 27, 2023. He was born March 18, 1940 in St Louis, MO. Donald was a long time employee of the Missouri Pacific-Union Pacific Railroad. He was the dear son of Donald and Elsie (nee Schneider) Kaelin who preceded him in death. Donald was the Beloved Husband of his dear wife, Ruby (nee Hetler) Kaelin. He was the Loving Father of Douglas Kaelin (deceased), Kristin Boudreau Lockhart (Neil), and Dr. Derek Kaelin (Megan). Donald is also the Cherished Grandfather of 8 grandchildren. Donald was the dear brother of Ruth Kaelin (deceased) and Kenneth Kaelin (deceased). He was also brother-in-law to Ed and Patty Hurley, Gene and Dee O'Neill, Jamie and Alan Tillit. Donald was a friend to many.