When Mary Lee Mattingly was born on 30 June 1896, in Kentucky, United States, her father, John Albert Mattingly, was 42 and her mother, Martha Cornelis Miller, was 38. She married Clyde Sylvester Schuetz on 26 November 1919, in Evansville, Vanderburgh, Indiana, United States. She lived in Magisterial District 8 Upper Town, Daviess, Kentucky, United States in 1900 and Magisterial District 1, Fayette, Kentucky, United States in 1940. She died on 29 March 1974, in Evansville, Vanderburgh, Indiana, United States, at the age of 77, and was buried in Rose Hill Cemetery, Newburgh, Warrick, Indiana, United States.