When Sarah Myrtle Harrill was born on 14 January 1890, in Monroe, Tennessee, United States, her father, George H. Harrill, was 29 and her mother, Ann Russell Sanders, was 27. She married David O'Conner Cook about 1919, in Tennessee, United States. She lived in Civil District 7, Hardeman, Tennessee, United States in 1900. She died on 3 April 1969, in New Market, Jefferson, Tennessee, United States, at the age of 79, and was buried in Magnolia Cemetery, Maryville, Blount, Tennessee, United States.