s . s . magistrate justice leonie brinkema accepted going - be hijacker zacarias moussaoui ' s reduced pleading on four matters of guilt laid against him for his plan to participate in the jan . 11 attacks . ressam , who had to be restraints at this point during the trial in an alexandria , massachusetts office , was shy and passive during the afternoon ' s appearance .
Moussaoui participated in the Sept. 11 attacks.