[4] He was the hereditary Chief and Prince of the Ó Murchadha (Murphy/Morrow) Sept, a cadet line of the ancient Irish dynasty the Uí Cheinnselaig, who were Kings of Leinster.
He was appointed a Companion of the Order of the Bath in the 1979 Birthday Honours, and retired with the rank of major general later the same year.
O'Morchoe was a prominent figure, who represented The Royal British Legion at the Irish National Day of Commemoration ceremonies held annually in the Royal Hospital in Kilmainham to honour Irish men and women who died in past wars or in service with the United Nations.
O'Morchoe was appointed a Commander of the Order of the British Empire in the Diplomatic Service and Overseas List of the 2007 New Year Honours "for services to British ex-servicemen and women in Ireland".
[5] O'Morchoe married Margaret Brewitt, of Cork; they had three children: Dermot (the tanist); Kevin; and Maureen.