On the 16th anniversary of the tragic events of September 11, 2001, FRONTLINE rebroadcasts the extraordinary saga of FBI special agent John O’Neill. As the bureau’s top counterterrorism agent, O’Neill – who investigated the bombings of the U.S. embassies in Africa and the attack on the USS Cole – joined then-national security counterterrorism co-coordinator Richard Clarke in believing that the United States should kill Osama bin Laden before Al Qaeda launched a devastating attack on America.