King Charles blamed his private secretary for making him publicly admit to being unfaithful to Princess Diana

King Charles reportedly blamed his former private secretary for his affair confession in 1994.

At the time, Charles and Princess Diana were still married but had been separated for two years.

Valentine Low, author of a new royal book, said it put an end to the private secretary's career.

In 1994, Charles, then known as the Prince of Wales, accepted an invitation to be interviewed on national television by British broadcaster Jonathan Dimbleby.

Valentine Low, author of "Courtiers: The Hidden Power Behind the Crown" released on Thursday, wrote that the  confession caused Charles "untold reputational damage."

Low added that it would also be the basis for his private secretary, Richard Aylard, to eventually leave his position in 1997.

Charles told Dimbebly during the interview that he was "faithful and honorable" to Diana during their marriage "until  it became irretrievably broken down, us both having tried."