When Lillian Katherine Leonhard was born on 22 January 1919, in Cleveland, Manitowoc, Wisconsin, United States, her father, Norbert Leonhard, was 24 and her mother, Malitta Kress, was 25. She had at least 1 son and 2 daughters with Marcel Dan Helf. She lived in Centerville, Manitowoc, Wisconsin, United States for about 10 years. She died on 6 February 2002, in Madison, Dane, Wisconsin, United States, at the age of 83, and was buried in Sheboygan, Sheboygan, Wisconsin, United States.