US reaches plea deal with alleged 9/11 mastermind Khalid Sheikh Mohammed  CNNFirst Thing: Chief 9/11 plotter pleads guilty in Guantánamo Bay deal  The Guardian USKhalid Sheikh Mohammed, accused as the main plotter of 9/11, agrees to plead guilty  NPRExclusive | 9/11 mastermind KSM and two other terrorists awaiting trial on Guantanamo Bay strike plea deals  New York Post Video 9/11 alleged mastermind and 2 others reach plea deal  ABC News