Diana's brother says interviewer Martin Bashir used lies and forged documents to convince his sister to speak out as her marriage to Prince Charles crumbled.
The actor is set to play the late Princess of Wales in the new biopic, "Spencer."
The Duke and Duchess of Sussex will not be featured in the Netflix series.
The late princess's younger brother Charles Spencer told Britain's Sunday Times how his sister longed for their mother's return.
Aug. 31 marked the 23rd anniversary of Diana's tragic death.
A commemorative statue will be installed next year on what would have been Diana's 60th birthday.
The "Tenet" actor has been tapped to star as the people's princess for the fifth and sixth seasons on Netflix's "The Crown."
“My wife said recently that our generation and the ones before us haven’t done enough to right the wrongs of the past. I too am sorry,” the Duke of Sussex said during the 2020 Diana Awards.
"Spencer" will be set over a three-day period in the early 1990s when the Princess of Wales realized her marriage to Prince Charles wasn’t working.
“Now they’re tearing his wife to pieces,” the actor said of the Duke and Duchess of Sussex's decision to step back from the royal family.