WASHINGTON  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.

The interview documents were made public through a lawsuit brought by the organization Citizens for Responsibility and Ethics in Washington, and included a 28-page typewritten summary of the interview with the prosecutor, Patrick J. Fitzgerald, and copies of handwritten notes taken by agents of the Federal Bureau of Investigation. In a statement, the organization said Mr. Cheney had displayed “an astonishing inability to recollect even simple facts.”

Mr. Cheney said in the interview that he could not recall how or when he had learned of Ms. Wilson’s identity and that he could not recall discussing it with Mr. Libby. Mr. Cheney denied knowing who, if anyone, at the White House had talked to the columnist Robert Novak about Ms. Wilson’s identity. He said he did not know of any reporters who might have been given this information before it was disclosed in Mr. Novak’s column on July 14, 2003.