After spending almost two decades in the U.S. military prison at Guantánamo Bay, Cuba, the alleged mastermind of the 9/11 terror attacks, Khalid Shaikh Mohammed, and ...

The letter, obtained by USA TODAY, said Khalid Sheikh Mohammed and two of his top lieutenants agreed to plead guilty "in exchange for the removal of the death penalty as a possible punishment." ...

The trial of the five 9/11 conspirators had been stuck in legal delays. Three of the five 9/11 defendants at Guantanamo Bay-- including alleged mastermind Khalid Sheikh Mohammed-- have reached a ...