 He had previously belonged to the New York Yacht Club, The Nineteenth Century Club, the Brooklyn Club, and Hamilton Club, and the Montauk Club.Pratt died on November 26, 1935 at Seamoor, his estate in Glen Cove, New York.He had been ailing since late 1922, with his dementia-like condition becoming serious in January 1935 after his brother George Dupont Pratt died.