Caledonian Mercury (Midlothian, Scotland), 23 June 1863: GILMORE-At Green Island, near Belfast, on the 12th inst., Colonel Gilmore, late of Boghead House, Antrim, Ireland, aged 75.
This might be death notice for his widow (I can only see partial extract). If so, she died in England (Somerset?) which, like Ireland, was all part of the U.K.
Western Gazette (Somerset, England), 16 Aug 1889 "widow of Col. Gillmore, of Boghead House, County Antrim. Ireland, aged 94."