Agency says it remains committed to solving the 5-year-old mystery WASHINGTON - The top FBI official in charge of the investigation into the deadly anthrax attacks has left the case, NBC News has learned. Richard "Rick" Lambert had been the inspector of the so-called AMERITHRAX case since September 2002, and had run every aspect of the five-year-old investigation. Just last month, he was transferred to the Knoxville, Tenn., field office of the FBI as its special agent in charge, according to the FBI. Lambert was the public face of the case, and his transfer is sure to fuel speculation that...