Jim Kelly, who was from Irvinestown in Co Fermanagh but who had a holiday home in the Donegal seaside town, was found near Nun’s Walk.
Relatives say Jim, who was a popular figure in the local community, had been treated in hospital in March after taking ill at Mass, complaining of feeling dizzy.
They believe the 73-year-old retired farmer may have suffered another episode of this recent illness when he fell.