John J. O'Neil was born on 1 Nov 1880 in Merthyr Tydfil, Breconshire, Glamorganshire, Wales; was christened on 6 Dec 1879 in Merthyr Tydfil, Breconshire, Glamorganshire, Wales; died on 1 Mar 1952 in Pittsburgh, Allegheny County, Pennsylvania; was buried on 5 Mar 1952 in Calvary Catholic Cemetery, Pittsburgh, Allegheny County, Pennsylvania, U.S.A..