As Washington and the White House came under siege by the K.U.F., he along with several Secret Service agents escorted President Asher and Prime Minister Lee to the P.E.O.C bunker. Suddenly, the Prime Minister's security detail revealed their true nature and, with the assistance of Dave Forbes, killed the bunker's occupants before taking the executive officials hostages. O'Neil was among the casualties as he was killed by Kang himself before he could do anything.
O'Neil was avenged after Mike killed Kang and the remaining terrorists in the bunker. Later, after Mike saved President Asher and prevented a nuclear meltdown across America, O'Neil was posthumously honored by President Asher in his speech in the aftermath of the attack.