| Regimental number | 48419 |
| Occupation | Miner |
| Next of kin | Brother, T O'Brien, Waipori, Otago |
| Rank on embarkation | Private |
| Unit name | New Zealand Expeditionary Force, 26th Reinforcements (1st Draft), Otago Infantry Regiment, D Company |
| Embarkation details | Unit embarked from Wellington on board HMNZT No 85 Willochra on |
| Final rank | Private |
| Final unit | 2nd Battalion, Otago Infantry Regiment |
| Fate | Died of wounds |
| Age at death from cemetery records | 40 |
| Place of burial | Menin Road South Military Cemetery (Plot III, Row O, Grave No 36), nr Ieper, Belgium |
| Miscellaneous information from cemetery records | Parents: William and Bridget O'Brien, Waipori, Otago |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
| Sources | Nominal Roll Vol. 3: Roll 66, p. 14 |