He was killed in an aeroplane crash on the way to his younger brother Louis's wedding in London.
Also killed in the crash were his mother, Grand Duchess Eleanore of Hesse, his wife Princess Cecilie of Greece, and their two sons, Louis and Alexander.
Wikipedia, Georg Donatus, Hereditary Grand Duke of Hesse.
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George Donatus is 29 degrees from Rosa Parks, 21 degrees from Anne Tichborne and 3 degrees from Victoria of the United Kingdom of Great Britain and Ireland on our single family tree. Login to find your connection.