This is probably the least likely cause of death to be found in Ireland and the two cases recorded on gravestones were in Fiji and the USA.
Bangor Abbey graveyard, County Down
[Large polished granite headstone] In memory of Henry Campbell, Ballycormick, died 28th August 1864 aged 50 years Also his sons, Robert died 11th Nov 1850 aged 5 years, Robert died 11th Jan 1854 aged 13 months, William Graham died 18th Feb 1856 aged 18 months And two daughters who died in infancy Also John, died 5th June 1874 aged 30 years Henry died from sunstroke at Suva, Fiji Islands, 1st Jan 1878 aged 31 years Rev Wm Edward died 23rd Dec 1885 aged 29 years Also his daughter Jane Weir, wife of Jerdan NICHOLS, died 14th May 1889 aged 29 years And their children, Mary Aileen and Douglas Campbell, who died in infancy Also Mary, daughter of above John Campbell, who died in infancy Mary, daughter of Henry Campbell, senr, wife of Thomas HARISON, BL, died 18th June 1891 aged 34 years His son Hugh died 16th Sept 1893 aged 51 years, husband of Kate Campbell, South Parade Mary GRAHAM, wife of Henry Campbell,
senr, died 13th November 1899 aged 81 years.
Larne and Inver Church of Ireland graveyard, County Antrim
[Sandstone Monument In Rail Surround] Sacred to the memory of Thomas Dixon who died 31st July 1863 aged 63 years and of his eldest son Francis McCambridge Dixon who died of Sunstroke at Westpoint USA 25th June 1866 aged 30 years, also two of his children Thomas and Sarah who died in infancy and Sarah wife of the above named Thomas Dixon who died 4th September 1873 aged 62 years, also their youngest son Alexander McCambridge Dixon who died 28th May 1926 aged 80 years and Harriett Elizabeth wife of Alexander McCambridge Dixon who died 22nd June 1940 aged 89 years.