On the Province of Manitoba Vital Statistics data bases
I found two death registrations for
Ethian Stone 10 May 1910 reg # 1909,003675 Winnipeg
Ephran Stone 10 May 1090 reg # 1909,003675 St Boniface
I suspect both of these are your man. St Boniface is part of Winnipeg now, but might have been considered to be a separate town in 1909.
For further information I suggest you search Manitoba Archives, Winnipeg Estates Index 1870 -1983. OT try to obtain an obituary contacting the Winnipeg Public Library would be a good first place to try.