When Kenneth Donald Smart was born on 8 July 1922, in Kansas, United States, his father, William Wyatt Smart, was 27 and his mother, Pearl Immaculate Brady, was 27. He married Betty Ann Orcutt on 28 December 1950. He lived in Lake Elsinore, Riverside, California, United States in 1935 and Mission Judicial Township, San Bernardino, California, United States in 1940. He died on 8 August 1996, in Solano, California, United States, at the age of 74, and was buried in Vacaville, Solano, California, United States.