A federal appeals court has overturned a plea agreement for Khalid Sheikh Mohammed, the alleged mastermind of the September 11 attacks. The deal would have allowed Mohammed to plead guilty in exchange for avoiding the death penalty. However, the court's decision reinstates the possibility of capital punishment. The ruling stems from a divided opinion within the court, raising questions about the future of the long-delayed trial. This move adds another layer of complexity to the already protracted legal proceedings surrounding the 9/11 attacks.