Aug. 31, 1997: Police remove the crumpled wreck of the Mercedez-Benz which was carrying Princess Diana in Paris early August 31. The car crashed in a an underpass in central Paris. Princess Diana, her companion Dodi Al Fayed and the driver were all killed in the crash. (Reuters)
Diana, the Princess of Wales during her visit to Leicester in this May 27, 1997 file photo, to formally open The Richard Attenborough Centre for Disability and Arts. The Princess was killed in a car crash in Paris Sunday August 31, 1997, along with her friend, Dodi Al Fayed, and their driver. (AP Photo/POOL)AP1997
The 90-minute documentary, "Unlawful Killing," by British actor and director Keith Allen includes a black and white close-up image of Diana shortly after the 1997 car accident in a Paris underpass that killed her.
The distressing paparazzi image has never been publicly seen in the UK, with Diana's face heavily pixelated when similar pictures were shown at the inquest into her death.
Mohammed al Fayed -- whose son Dodi also died in the accident -- has reportedly financially backed the film. A spokesman said, however, that the former Harrods department store owner had not been aware the photograph would be shown.
"He is appalled by that and will be taking all necessary steps to make sure it is not in the film," the spokesman said.
Princes William and Harry have declined to comment but royal sources told the Daily Mail the pair were sickened.
"They rather hope people would treat this with the contempt it deserves," the source said.
The film exploring Diana's death will premiere at the famous French film festival this week because British lawyers insisted on 87 cuts to the film, according to Allen.
It will be shown, he said, in the US and around the world, but will not be screened in the UK.