After the war, the Duke and Duchess became celebrities and hosted parties and lived between Paris and New York. In the 1960s, the Duke's health became worse. Because he was a heavy smoker from an early age, he had throat cancer. On 28 May 1972, the Duke died at his home in Paris, less than a month before his 78th birthday. Wallis Simpson was not strong. She suffered from dementia and died 14 years later. The coffin was buried in the Royal Burial Ground behind the Royal Mausoleum of Queen Victoria and Prince Albert at Frogmore.