Dennis Joseph O'Neil was born on 17 Nov 1882 in Merthyr Tydfil, Breconshire, Glamorganshire, Wales; was christened on 3 Dec 1881 in Merthyr Tydfil, Breconshire, Glamorganshire, Wales; died on 19 May 1955 in Pittsburgh, Allegheny County, Pennsylvania; was buried on 23 May 1955 in Calvary Catholic Cemetery, Pittsburgh, Allegheny County, Pennsylvania, U.S.A..