A controversial documentary about Princess Diana's death will debut at The Cannes Film Festival in France, which began Wednesday and runs through May 22.

The film, Unlawful Killing, alleges that Diana knew and told friends the British royal family was conspiring to kill her, and that her death was murder. The 90-minute movie is backed by Mohammed Fayed, whose son Dodi, Diana's lover, was also killed in the crash.

British theaters have refused to show the film due to its graphic content, some of which is hinted at in the trailer. The film supposedly shows a photo of Diana as she lays dying after the crash in a Paris tunnel.

In a column over the weekend, director Keith Allen wrote that British lawyers insisted on 87 cuts to the film before a UK release could be considered. So, Allen decided to show the film cut-free in France instead.

See a sneak peek of the movie featuring Piers Morgan after the jump.