Twenty-five years ago, on September 11, 2001, nineteen individuals hijacked four commercial airplanes and intentionally crashed them into significant targets in the United States, including the World Trade Center towers in New York City and the Pentagon in Washington, D.C. These attacks, which resulted in nearly 3,000 deaths, were widely attributed to the terrorist group al-Qaeda. At the time, Osama bin Laden, the leader of al-Qaeda, was identified as the group’s principal figure, though he was not directly seen participating in the attacks. Behind the planning of the attacks was a man known as Khalid Sheikh Mohammed, who is considered the mastermind of the September 11th attacks. He was captured in Pakistan in 2003 by U.S. forces and has since been held at the U.S. military prison at Guantánamo Bay, Cuba. Mohammed has been charged with a range of offenses, including conspiracy to commit the 9/11 attacks, and his trial has been a subject of legal and political debate for years. The legal process for Mohammed has been delayed multiple times due to procedural issues, concerns about the fairness of the trial, and questions about the treatment of detainees at Guantánamo. Originally, his trial was expected to begin in 2007, but it has faced numerous postponements. As of now, the trial has not yet taken place, even though more than two decades have passed since the attacks. Legal experts have pointed out that the trial of Khalid Sheikh Mohammed is not only a matter of justice but also a test of the U.S. legal system’s ability to handle complex cases involving national security and international law. The case has raised important questions about due process, the rights of the accused, and the long-term consequences of the war on terror. Despite the passage of time, the trial remains a significant, unresolved chapter in the aftermath of September 11th.