I am researching Charles Moore who married Margaret/Mary Robinson c 1898 in Donegal. They appear in the 1901 Irish census with their daughter Isabella aged 1 year.

By 1911 Margaret is married to an Andrew Stafford and all her children to Charles are stated as step children to Andrew. The children are :
Isabella aged 11
John William aged 10
Charles aged 8
Frances Anne J aged 7
Violet Margaret aged 5
Andrew aged 3

Charles is believed to have died in an unmarked grave c 1907/08.
Is there any way I can locate online death records for Donegal around this time? I have checked the IGI ancestry, genuki, but nothing so far. Are there any Irish newspapers online? I live in Australia so am unable to visit any repositories locally.
Any suggestions would be much appreciated.
Kindest regards
Narelle