| Regimental number | 24311 |
| Date of birth | |
| Place of birth | Kumara, Westland |
| Religion | Church of England |
| Occupation | Law clerk |
| Address | 5 Cowper Street, Greymouth |
| Marital status | Single |
| Age at embarkation | 21 |
| Height | 5' 7.5" |
| Weight | 172 lbs |
| Next of kin | Father, W J McIlroy, 5 Cowper Street, Greymouth |
| Previous military service | 4 years, Nelson College Cadets (1908-1912); 1 year, Greymouth Senior Cadets (1913); still serving, 2nd Lieutenant, Senior Cadets, Dunedin |
| Enlistment date | |
| Place of enlistment | Trentham |
| Rank on embarkation | Lieutenant |
| Enlistment status | Volunteer |
| Unit name | New Zealand Expeditionary Force, New Zealand Rifle Brigade, 8th Reinforcements to 3rd Battalion, G Company |
| Embarkation details | Unit embarked from Wellington on board HMNZT 65 Pakeha on |
| Final rank | Lieutenant |
| Final unit | 1st Battalion, New Zealand Rifle Brigade |
| Fate | Killed in Action |
| Age at death from cemetery records | 22 |
| Place of burial | No known grave |
| Commemoration details | Tyne Cot Memorial (New Zealand Apse, Panel 7), Tyne Cot Cemetery, Belgium |
| Miscellaneous information from cemetery records | Parents: William John and Mary Ann Laura McIlroy, 108 Rossall Street, Christchurch. Native of Kumara, Greymouth |
| Family/military connections | Brother: 17807 Cpl Arthur Harold McILROY, 2nd Battalion, The New Zealand Rifle Brigade, killed in action 12 October 1917 |
| Other details |
War service: Western Front Embarked Wellington, 23 September 1916; disembarked Devonport, England, 18 November 1916, and marched into Sling Camp. Proceeded overseas to France, 4 December 1916; joined 1st Bn, NZ Rifle Brigade, in the field, 6 January 1917, and posted to C Company. Detached to Stokes Gun School, 14 January 1917; rejoined unit, 23 January 1917. Granted temporary rank of Captain, 21 April 1917; relinquished temporary rank of Captain, 8 June 1917. Attached to NZ Wing, 2nd Anzac Reinforcements Camp, 20 June 1917. Detached to 2nd Army School, 20 June 1917; rejoined unit, 26 July 1917. Sightly wounded, but remained on duty, 16 August 1917. Proceeded on leave, 13 September 1917; rejoined unit from leave, 13 September 1917. Killed in action, 12 October 1917. Medals: British War Medal, Victory Medal |
| Sources | Nominal Roll Vol. 2: Roll 41, p. 33 Archives New Zealand (Wellington), Agency AABK, Series 18805, File 7880411 |