LONDON, England (CNN) -- Claims by Diana's former butler that he knew a mysterious "secret" about the late princess have been trashed by the coroner in her inquest. Diana's former butler has given conflicting information at the enquiry into her death. The coroner said the information was already in the public domain and some of it was even mentioned in one of Paul Burrell's own books. Considered the first star witness of the inquest, Burrell's appearance Tuesday was delayed after the coroner asked him to retrieve the last letter the princess gave him. Monday, the ex-butler -- once described by the princess as "her rock" -- told the inquest the letter contained a "secret," which he claimed he could not remember.
@highlight
Claims by Diana's butler that he knew "secret" about her trashed by coroner
@highlight
Paul Burrell asked to testify about the last letter the late princess gave him
@highlight
Coroner revealed Burrell's "secret" was Diana planned to buy property abroad
@highlight
But coroner said the revelation is "fairly and squarely in the public domain"
Maggie Rae said at the inquest that @placeholder also believed there was a plot to seriously injure her in an accident.