| Regimental number | 12/3118 |
| Address | Maromaku |
| Marital status | Single |
| Next of kin | Father, C J O'Neill, Maromaku, Bay of Islands |
| Rank on embarkation | Private |
| Enlistment status | Volunteer |
| Unit name | New Zealand Expeditionary Force, 7th Reinforcements, Auckland Infantry Battalion |
| Embarkation details | Unit embarked from Wellington on |
| Final rank | Lance Corporal |
| Final unit | 3rd Battalion, Auckland Infantry Regiment |
| Fate | Killed in Action |
| Age at death from cemetery records | 23 |
| Place of burial | Tyne Cot Cemetery (Plot XXIX, Plot E, Row No 6), Belgium |
| Miscellaneous information from cemetery records | Parents: Charles John and Millicent O'Neill, Maromaku, Bay of Islands. Native of Waikato |
| Other details |
Medals: 1914-15 Star, British War Medal, Victory Medal |
| Miscellaneous details | Nominal Roll Vol. 1: Auckland Infantry Batln/Seventh |