Dennis O'Brien (policeman)
Detective Sergeant Denis O'Brien, Registration Number: 8288 (17 June 1899 – 9 September 1942), often called "Dinny O’Brien", was a veteran of the Irish War of Independence and the Irish Civil War. He joined the Garda Síochána in 1933 and was killed by the Anti-Treaty IRA.
Read more about Dennis O'Brien (policeman): Early Life, Police Career, Assassination, Aftermath