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Diana sustained fatal injuries in a car crash. However, there are a number of conspiracy theories.
Diana, Princess of Wales until her death in 1997.
No, it was not. Princess Diana died because the driver of the vehicle she was in was driving under the influence and crashed the vehicle.
Because Prince Charles was - and still is - the Prince of Wales when she married him.
Her name was never Princess Diana. He correct title was Diana, Princess of Wales.
Diana, Princess of Wales, was divorced from Prince Charles, the Prince of Wales, in 1996.