QUOTE (David Porter @ Sep 3 2009, 12:55 AM)

The only Rigby death registered in Colchester at that time is this one.
Deaths Sep 1915
------------------------------------------------
Rigby Thomas S 52 Colchester 4a 676
Looks promising...
Thomas Steventon RIGBY, born Mile End Q2 1863. Son of Thomas and Mary A, of 115 Mile End Rd, Stepney (in 1901). Occupation Election Agent.
THE LONDON GAZETTE, JUNE 17, 1902
VOLUNTEER CORPS.
ROYAL GARRISON ARTILLERY (VOLUNTEERS).
1st Essex, Lieutenant E. B. Baker resigns his Commission. Dated 18th June, 1902.
Thomas Steventon Rigby, Gent., to be Second Lieutenant. Dated 18th June, 1902.
THE LONDON GAZETTE, DECEMBER 8, 1908
TERRITORIAL FORCE.
ROYAL FIELD ARTILLERY.
1st Essex Battery, 2nd East Anglian Brigade; the undermentioned officers, from the 1st Essex Royal Garrison Artillery (Volunteers), are
appointed to the battery, with rank and precedence as in the Volunteer Force. Dated 1st April, 1908 :-
Captain and Honorary Major Edgar Percival Bidwell. (To be supernumerary.)
Captain Harold Jolly. (To be supernumerary.)
Lieutenant Robert Andrew Hatton.
Lieutenant Thomas Steventon Rigby.
In the 1911 Census he's a Parliamentary Election Agent boarding at 1 Rectory Sq, Stepney.
Adrian
EDIT to add:
THE LONDON GAZETTE, 9 OCTOBER, 1914
ROYAL FIELD ARTILLERY.
1st London Brigade;
Thomas Steventon Rigby (late Lieutenant, 2nd East Anglian Brigade) to be Lieutenant. Dated 25th September, 1914.