Prosecutors allege that Khalid Sheikh Mohammed conceived and executed much of al-Qaida's plan for the September 11 attacks, which are detailed in a contested plea agreement.

As part of this plea agreement, Mohammed and two co-defendants have agreed to plead guilty in exchange for life sentences, rather than facing the death penalty.

Negotiations for this plea deal took over two years, aiming to resolve a case that has been in pretrial hearings for more than two decades.

Former Defense Secretary Lloyd Austin attempted to void the plea agreement, arguing that decisions regarding the death penalty should be managed by defense secretaries.

Ongoing federal court hearings are examining the Defense Department's efforts to retract the plea agreements, complicated by issues of torture and trial logistics.

Legal disputes regarding the admissibility of statements made under alleged torture while in CIA custody have contributed to delays in the trial process.

The evidence against Mohammed includes his statements, phone records, and alleged coordination with the hijackers, along with videos from al-Qaida's planning sessions.

In court, photos and death certificates of the 2,976 victims from the attacks at the World Trade Center, Pentagon, and in Pennsylvania will be presented.

Major news organizations, including the Associated Press and The New York Times, are suing to unseal the plea bargains related to the case, indicating potential for further revelations.

An unusual aspect of the plea agreement allows for a hearing to publicly disclose evidence, addressing concerns from victims' families.

The evidence summaries hint at potential further revelations about the attacks in the future.

Newly unsealed documents provide detailed evidence against Mohammed, the alleged mastermind of the September 11 attacks.