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What was Princess Diana’s cause of death?

On August 31, 1997, Princess Diana was involved in a fatal car crash in Paris. The driver, Henri Paul, and her companion, Dodi Fayed, were killed on impact. Diana was taken to Pitié-Salpêtrière Hospital, where doctors discovered that she had suffered a rare tear to a pulmonary vein, which caused massive bleeding. Efforts to save her were unsuccessful. Diana died at approximately 4:00 AM (local time), about 3.5 hours after the crash. She was 36 years old. The only survivor was security guard Trevor Rees-Jones.