Channel 4 will be showing Diana: The Witnesses In The Tunnel, which will feature photographs taken of the accident scene that took Diana’s life.
The secretary for the two Princes wrote a letter to the television channel asking that the show not be aired, saying that the documentary was a "gross disrespect" to their mother’s memory.
Channel 4 management took the request into consideration, but decided that the public would be interested in the program.
The documentary will show pictures taken by French photographers at the accident scene in 1997 in Paris. Some of the images show Diana in an ambulance.
Diana, 36, and her friend, Dodi Al Fayed, 42, and their driver, Henri Paul, all lost their lives in the accident. The car was reportedly being chased by members of the paparazzi.