As revealed in Ronald Kessler's book "The Bureau: The Secret History of the FBI", Kessler and his wife Pamela interviewed Koecher and his wife Hana for five days after their return to Prague. The book says Koecher introduced Hana, a sexy blonde with enormous blue eyes, to swinging. She liked it so much that she became a far more avid swinger than he was. As Hana served dinner on the deck of their home, Kessler asked Koecher how he felt about Ogorodnik's death.