I have got stuck on my G Grandfathers brothers side of the family

William Edward Hearn, DOB 1863 Born Islington
Married Mary Ann Hearn Born Kings Cross DOB 1866
1901 Lived at 63 Guinness Buildings Bermondsey.
BY the 1911 census William had died.
Mary in 1911 living at 71 Guinness Buildings Snow's Field St St Olave Bermondsey.
I would like some more info on William if possible and Mary.
My Dad thought that William may have served in the Army overseas at some time?
Keith