| Regimental number | 4461 |
| Religion | Roman Catholic |
| Occupation | Confectioner |
| Marital status | Single |
| Age at embarkation | 29 |
| Next of kin | Father, William O'Shannessy, 2 Little Mill Street, Adelaide, South Australia |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 23rd Battalion, 11th Reinforcement |
| AWM Embarkation Roll number | 23/49/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board RMS Malwa on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 23rd Battalion |
| Fate | Killed in Action |
| Age at death from cemetery records | 31 |
| Place of burial | Railway Dugouts Burial Ground (Transport Farm) (Plot VI, Row N, Grave No. 20), Zillebeke, Belgium |
| Panel number, Roll of Honour, Australian War Memorial | 100 |
| Miscellaneous information from cemetery records | Parents: william and Annabell O'SHANNESSEY (as spelt), 23 Mill Street, Adelaide, South Australia. Native of Victoria |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |