Khalid Sheikh Mohammed, the head plotter, will finally go to trial years after the terror attack.

A military judge on Friday threw out part of a confession made by Khalid Sheikh Mohammed, the alleged mastermind of the Sept. 11, 2001, terror attacks.

In his ruling, military judge Lt. Col. Michael Schrama wrote that statements made by Mohammed to investigators in 2007 were not given voluntarily, the New York Post reported. 

Khalid Sheikh Mohammed, the accused mastermind of the Sept. 11, 2001, terror attacks, has been held at Guantánamo Bay since 2003. (AP)

The ruling could complicate what has been a decades-long wait for the suspected plotter to stand trial.

This is a developing story. Please check back for updates. 

Louis Casiano is a reporter for Fox News Digital. Story tips can be sent to louis.casiano@fox.com.

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