Denis O'Brien | |
|---|---|
| Born | 17 June 1899 Dublin, Ireland |
| Died | 9 September 1942 (aged 43) |
| Other names | Dinny |
| Spouse | Anne Cooney |
| Police career | |
| Department | Garda Síochána Special Branch Division |
| Service years | 1933–1942 |
| Rank | Detective Sergeant |
| Badge no. | 8288 |
Detective Sergeant Denis O'Brien (17 June 1899 – 9 September 1942), sometimes 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 in 1942.[1]