He is in Memorial service 21 Nov 1922 as missing.
However there is a record of an RG Brown in RASC dead in Jan 1922 I have no idea if they are the same man
1889 Apr 21 Born Devizes, Wiltshire as George Reginald Brown
1891 Censuus in WIlts
1911 census He is a Boarder & Engineer at a house in Far Cotton, Northants
1915 Nov . enlisted as 104477 Private Reginald George Brown, 19th (Service) Battalion (2nd County), Durham Light Infantry which was formed as a Bantam Battalion. Occupation Engine fitter
1916 Feb 1 landed at Le Havre.
1917 Jan Battalion ceased to be a Bantam Battalion.
1920 Jan 27 re-enlisted into Royal Army Service Corps at Whitehall aged 31 years and 301 days old.
M/21000, EMT/61062, 54945 Reginald George Brown 1165 Company, RASC
1920 Jan 28. posted to Avington Park
1920 Jan 31. posted to Mobilisation and Embarkation Area Headquarters – Bulford
1920 May 10 posted to no.3 Embarkation Depot at Southampton Dock
1920 Sep 5, posted to 1165 MT Company at the Curragh as I C Driver Class III
1921 Jan 13 Police Gazette gives him as deserting from Doroughmore in Co.Cork in January 1921
1921 On the Absent Voters List: 23 Crispin Street, Newcastle Upon Tyne, Northumberland as M/21000 Reginald George Brown, RASC
1921 Jan 31. reported missing from the 1165 MT Company at the Curragh (The Police Gazette gives place of desertion as Donoghmoor)
Denis Dwyer stated in a Witness Statement he was part of a firing party that carried out the execution of an un-named British soldier, which almost certainly was Brown. Ballyvalloon is about 5 to 6 kms east of Donoghmoor
1922 Nov 21. listed as missing fate unknown
1923 Jan 13. Death accepted for official purposes as having occurred on or since 31 Jan 1922
23 Feb 1923 Part II Orders 615 Company (Dublin)
Salary owed to him had to be advertised in the Gazette for next of kin no.DLXVII (567)