there seems to be some controversy on the details of his death. There was no autopsy due to idea that one was not needed because there was no signs of foul play. The controversy comes in play when the story of the person who found him dead changes. The full story can be found at Wikipedia.
Morrison is buried in the Père Lachaise Cemetery in Paris, one of the city's most visited tourist attractions. The grave had no official marker until French officials placed a shield over it, which was stolen in 1973. In 1981, Croatian sculptor Mladen Mikulin placed a bust of Morrison and the new gravestone with Morrison's name at the grave to commemorate the 10th anniversary of his death; the bust was defaced through the years by cemetery vandals and later stolen in 1988. In the 1990s Morrison's father, George Stephen Morrison, placed a flat stone on the grave. The stone bears the Greek inscription: ΚΑΤΑ ΤΟΝ ΔΑΙΜΟΝΑ ΕΑΥΤΟΥ, literally meaning "according to his own daemon" and usually interpreted as "true to his own spirit". Mikulin later made two more Morrison portraits in bronze but is awaiting the license to place a new sculpture on the tomb.