It seems that you are not famous until a conspiracy theory appears after you die and in the case of Paul McCartney, even before you die.
In 1997, Diana the Princess of Wales and Dodi Fayed (son of Mohamed Fayed, owner of Harrods) were killed in a car crash while trying to escape from press photographers in Paris.
Dodi was Muslim whilst Diana was the mother of the future head of the Church of England which has led many people to speculate that they were actually killed in order to prevent further scandal to the throne of England.
Motivations which have been advanced for such a conspiracy include suggestions that Diana intended to marry Dodi Fayed, that she intended to convert to Islam and that she was pregnant.
Organisations which conspiracy theorists suggest are responsible for her death have included French Intelligence, the press, the British Intelligence services MI5 or MI6, the CIA, Mossad or the Freemasons but mostly the spotlight has fallen on The Duke of Edinburgh and the British Royal Family who were openly displeased with the way the Princesses and mother to the next heir to the throne was conducting herself in relationships with men.
At least the conspiracy theories surrounding Princess Diana started after she died, for Paul McCartney they began while he was still alive.
The theory goes that Paul McCartney of the The Beatles died in 1966 and was replaced by a look-alike and sound-alike. Evidence for McCartney’s death consists of 'clues' deliberately placed in later Beatles recordings including statements allegedly heard when a song is played backwards, symbolism found in obscure lyrics, and ambiguous imagery on album covers and the final nail in the coffin as it were that McCartney is the only barefooted Beatle and is out of step with the others on the cover of Abbey Road.