He’s listed in the East India Register & Army Lists 1855 – Bengal Medical Establishment
Stokes, John M; date rank: 5 May 1849; remarks 29th Nat. Inf.
But not listed as casualty of the mutiny at http://glosters.tripod.com/memindex3.htm
Check for an obituary in the Times, otherwise any records will be in the India Office collection of the British Library, London. – records not online – see http://www.bl.uk/reshelp/findhelpregion/asia/india/indiaoffi...
Note the online family search records are only about 10% of their total holdings.