When Isaac Garrett Killebrew was born about 1856, in Mississippi, United States, his father, Thomas Agee Killebrew, was 33 and his mother, Sarah Frances Haddock, was 21. He married Susan Elizabeth Elviney Charity Coggins on 31 January 1887, in Holmes, Mississippi, United States. They were the parents of at least 1 son and 2 daughters. He lived in Beat 3, Holmes, Mississippi, United States in 1880. He died in 1893, in Holmes, Mississippi, United States, at the age of 37.