In their 1991 book, "D.B. Cooper: The Real McCoy", parole officer Bernie Rhodes and former FBI agent Russell Calame asserted that they had identified McCoy as Cooper. They cited obvious similarities in the two hijackings, claims by McCoy's family that the tie and mother-of-pearl tie clip left on the plane belonged to McCoy, and McCoy's own refusal to admit or deny that he was Cooper. A proponent of their theory was the FBI agent who killed McCoy. "When I shot Richard McCoy," he said, "I shot D. B. Cooper at the same time."