Former Vice President Dick Cheney denied in an interview with a special prosecutor investigating the C.I.A. leak case that he had played any role in the disclosure of the identity of Valerie Wilson as an intelligence officer, according to F.B.I. documents released Friday.

Some of the assertions by Mr. Cheney in his interview with the prosecutor on May 8, 2004, appeared to conflict with testimony at the 2007 trial of his chief of staff, I. Lewis Libby Jr., who was convicted of perjury and obstruction of justice and whose sentence was later commuted by President George W. Bush.