A bombshell new documentary is set to air on Channel 4 and sources have confirmed that neither the Duke of Cambridge nor the Duke of Sussex were consulted ahead of the four-part series. Investigating Diana: Death in Paris will be broadcast on Channel 4 later this month to coincide with the anniversary of Diana's death in 1997 and the series will examine conspiracy theories which producers say they want to “put to rest”.The documentary will "tell for the first time the full story" of investigations by the French Brigade Criminelle and the Met Police into Diana's death and will feature interviews with detectives from both forces, some of whom are speaking of their experiences for the first time.