Diana and her boyfriend , Dodi Al-Fayed , died in a car crash in Paris on 31 August 1997 . On 31 August 1997 , Diana was fatally injured in a car crash in the Pont de l'Alma road tunnel in Paris , which also caused the deaths of her then boyfriend , Dodi Al-Fayed and the acting security manager of the HÃ tel Ritz Paris , Henri Paul , who was their chauffeur .