Dermot O'Brien was born on October 23, 1932 in Ardee, County Louth, Ireland. He was married to Rosemarie Walsh. He died on May 22, 2007 in Ardee, County Louth, Ireland.
Gaelic football centre-forward (1952-1960) turned musician who sang and played accordion with his own band Dermot O'Brien and His Club Men (1962-1972) and then performed solo for the rest of his life.