When William Toomey was born on 23 March 1885, in Chicago, Cook, Illinois, United States, his father, William Toomey, was 42 and his mother, Mary Harrold, was 34. He married Kathryn Faehtke on 2 September 1914, in Chicago, Cook, Illinois, United States. He died on 6 November 1962, in La Grange, Cook, Illinois, United States, at the age of 77, and was buried in Queen of Heaven Cemetery, Hillside, Cook, Illinois, United States.