Since Al Qaeda conspirator Zacarias Moussaoui was arrested in August 2001, the 37-year-old Frenchman has refused to cooperate with his lawyers, often speaking out and disrupting the courtroom with outbursts.

Here are some highlights from Moussaoui's testimony at his death penalty trial Monday, his April 2005 conspiracy trial and other court appearances:

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"I'm sorry, I don't know about the number of planes but I was not the fifth [pilot] hijacker." — March 27

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"Because everybody used to refer to me as the 20th hijacker and it was a bit of fun." — When asked by his lawyer why he signed a guilty plea in April 2005 as the "20th hijacker," March 27

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"I had knowledge that the Twin Towers would be hit. I didn't know the details of this." — March 27

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"I will testify, Zerkin, whether you want it or not," referring to one of his lawyers, Gerald Zerkin, on March 23.

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"It is correct that I want to plead guilty to the six charge that face in the indictment. It's absolutely correct." — April 22, 2005, during his hearing at which he pleaded guilty to six counts of conspiracy related to the Sept. 11 terrorist attacks.

"So I am guilty of a broad conspiracy to use weapon of mass destruction to hit the White House if the American government refuse to negotiate." — April 22, 2005.

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"I have no participation in Sept. 11, but ... I have certain knowledge about Sept. 11, and I know exactly who done it. I know which group, who participated, when it was decided." — July 18, 2002.