He doesn't show up on Find A Grave, could be buried in either Scotland or England.
"WHAT SOUTH AFRICA DID FOR HIM."
A Soldier's Suicide.
Private Robert Coxon, King's Own Scottish Borderers, has died at the Military Hospital, Berwick, from injuries received by throwing himself from a third storey window on Monday last. Coxon had been invalided home from South Africa, where he suffered from enteric fever. Deceased left on the table in his room a paper on which was written, "This is what South Africa has done for me. Good-bye."
There could have been more such cases post-war, we'll never know how many. An advanced search of Welsh Newspapers Online for 'suicide' and 'South Africa,' between 1899 and 1919, brings up some interesting results.
SWB wrote: Interesting another suicide related to enteric.
Probably Pte 107 RU Coxen (sic) marked on the medal rolls as "deceased" and also "discharged". Not in the official casualty rolls.
Redmond Uniacke Coxon, born in Bombay, and died aged 37. Probably the son of Edward Coxon and Georgina (nee Uniacke) Coxon; Edward Coxon was a captain in the army. Georgiana's branch of the Uniacke family was from Carrig, Ireland.