Earl Charles Spencer claims King Charles III sounded 'giddily elated' after Diana's death in memoir due 22 September

Earl Charles Spencer, Princess Diana's brother, claims in Swan Song: Diana, My Sister, due 22 September, that King Charles III sounded "giddily elated" on the morning she died. He also claims the King said "Rest assured, we'll forget her soon enough!" before her funeral. He recalls learning of her death on 31 August 1997.