Plea Agreements Reached with 9/11 Defendants Khalid Shaikh Mohammad, Walid Bin ‘Attash and Mustafa al Hawsawi Department of DefenseUS reaches plea deal with alleged 9/11 mastermind Khalid Sheikh Mohammed CNN9/11 Mastermind Avoids Death Penalty in New Plea Deal The Daily BeastAccused Sept. 11 Plotters Agree to Plead Guilty at Guantánamo Bay The New York Times