After years of delays, a significant step took place last week when a former aide to Mohammed, Majid Khan, accepted a plea deal with US authorities that will require him to testify against other terror suspects at a tribunal at Guantanamo Bay, Cuba.
More than a decade after the 2001 attacks that left nearly 3,000 people dead on US soil, the 46-year-old extremist known simply as "KSM" remains the ultimate figurehead in a legal battle fought by two successive US administrations.
President Barack Obama "can claim credit for killing (Osama) bin Laden and (al Qaida cleric Anwar) Al-Awlaqi, so nailing KSM would complete the hat trick and help quiet the conservative fearmongers who say he's weak on terrorism," former chief US military prosecutor Colonel Morris Davis told AFP.
Victory in the trial could prove critical to Obama this year in his re-election bid, where he faces Republicans critical of his approach to terrorism.
The Democratic president had sought to hold a trial for KSM and his four accused accomplices in New York, just steps from the Ground Zero site where the World Trade Center's twin towers fell.
But congressional Republicans put an end to those plans by blocking the transfer of terrorism suspects to the United States.
The five September 11 defendants, known as the "Guantanamo Five" for their incarceration at the US naval base in southern Cuba, will face a trial under special military tribunals created by the George W Bush administration after the attacks.
Procedures for the military tribunals, also known as commissions, were modified by the Obama administration.
KSM, along with Walid bin Attash of Saudi Arabia, Yemen's Ramzi bin al-Shibh, Pakistan's Ammar al-Baluchi or Ali Abd al-Aziz Ali and Mustafa al-Hawsawi of Saudi Arabia, all face possible death penalties.
The 88-page indictment lists 2,976 murder counts for each of the victims of the coordinated attacks.
"Let's get rid of the alleged. KSM has admitted (the crimes) many times," said Michael Mukasey, who served as US attorney general under Bush.
KSM's first confessions were made when he was subjected 183 times to a simulated drowning method known as waterboarding and other so-called "enhanced" interrogation techniques at a secret CIA prison after his March 2003 capture.
But "no statement obtained as a result of coercion can be used" in a military commissions trial, chief prosecutor Brigadier General Mark Martins said in an interview.
Although KSM has since repeated his confessions, the prosecution needs to obtain statements that are legally admissible in court.
This is where Khan's awaited testimony fills the gap. The Pakistani national, who lived legally in America and graduated from a US high school, pleaded guilty at Guantanamo to a reduced charge of "conspiracy" to commit terrorism in exchange for a lighter sentence.
"If Khan provides information on KSM and others, as has been suggested was part of the deal, it will no doubt speed up the prosecutions," said Karen Greenberg, a terrorism expert at Fordham Law School.
With Khan's testimony in hand, KSM can be officially tried before a Guantanamo judge, which observers say could take place at any time.
The person who presides over the commissions, a judge known as the convening authority, now has "everything he needs to make the decision but he's not under a timeline," Martins said.
Baluchi has requested that he be spared the death penalty, saying he played a lesser role in the attacks.
But, following a vote in Congress, if the Guantanamo Five plead guilty, "they're allowed to be executed," said Adam Thurschwell, a general counsel in charge of defending Guantanamo detainees.
Baluchi's lawyer, James Connell, said it is the convening authority's choice to decide a date for the trial.
"We don't want them to rush into a decision but on the other hand, we don't want them to drag their feet," he added.
Although the defendants might make pre-trial appearances soon, the crucial trial could be months away.
"KSM wanted to use the rest of the trial as an opportunity to deliver a diatribe against US policy," said appellate attorney David Rivkin.
KSM himself has declared that he wants to die and become a martyr.
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@Babloo:
it was Khakid Sheikh Muhammad of Pakistani descent.
Please mention complete ," Kuwaiti citizen of Pakistani descent, Khalid Shaikh Mohammad".
After all alot of us consider Arabs as our godfathers.
@Tony C.: He claimed it and it makes for attractive headlines. True, false or otherwise you will not see any US official not say it was OBL. They'd probably pass a lie detector test about that also. Often times a subordinate will make attempts at taking a fall for their "leader" out of some form of loyalty as well. The chances increase drastically for it to occur when it's an extremist organization that claims dying to further their cause is better than living, no contest.
People forget that the 9/11 master mind was not Bin Laden, it was Khakid Sheikh Muhammad of Pakistani descent.
I am getting confused again. I thought the Americans said that they had killed the mastermind of 9/11 when they found Osama Bin Laden in Abbottabad. It is starting to get like the old Hollywood Saturday movie matinee shows. They find a new bad guy whenever a little excitement, for a dumbed-down public, is required.
I thought the real mastermind was Ariel Sharon
self proclaimed eh. oh right how many times dis they have to waterboard the guy to nake him 'confess'? heck!! more than 200 times right? Gee i'd confess to anything and everything after the second or third time.
Israel is the master mind of 9/11. America is afraid to say it.
I hope that he is dropped alive from the top of the tallest tower in New York.