[2] He attended Westland Row Christian Brothers School, as very many future Irish republicans did, including Patrick and Willie Pearse.
After leaving school in 1897, he took up a career as a solicitor's clerk, an occupation that would train him well for the many administrative and financial positions he would take in the Republican movement.
During the Rising, Ó Murchadha spent the week in Boland's Mill as second lieutenant to Commandant Éamon de Valera.
He was officer commanding of the republican prisoners in Harepark Internment Camp, Curragh, County Kildare.
[4] At the time of his death, on 28 April 1958, he was living at 217 South Circular Road, Dolphin's Barn, Dublin.
[4] On 26 May 2016, one of his grandsons, Brian Murphy, a member of the Irish Republican Prisoners Welfare Association,[7] was wrestled by Canadian ambassador Kevin Vickers as he disrupted a commemoration of British soldiers killed in the Easter Rising at Grangegorman Military Cemetery in Dublin.