| Regimental number | 3605 |
| Place of birth | Northcote Victoria |
| Religion | Roman Catholic |
| Occupation | Stoker |
| Address | 142 Vincent Street, Leederville, Western Australia |
| Marital status | Single |
| Age at embarkation | 22 |
| Next of kin | Father, Michael James Herbert O'Reilly, 142 Vincent Street, Leederville, Western Australia |
| Enlistment date | 1 October 1915 |
| Date of enlistment from Nominal Roll | 23 September 1915 |
| Rank on enlistment | Private |
| Unit name | 28th Battalion, 8th Reinforcement |
| AWM Embarkation Roll number | 23/45/2 |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A30 Borda on 17 January 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 51st Battalion |
| Fate | Returned to Australia 15 January 1919 |
| Date of death | 8 August 1961 |
| Place of burial | Boxhill Cemetery |
