So it turns out the reason the "21st" highjacker Zacarias Moussaoui didn't get the death penalty was because of a single juror:
Only one juror stood between the death penalty and Zacarias Moussaoui and that juror frustrated his colleagues because he never explained his vote, according to the foreman of the jury that sentenced the al-Qaeda operative to life in prison last week.The foreman, a Northern Virginia math teacher, said in an interview that the panel voted 11 to 1, 10 to 2 and 10 to 2 in favor of the death penalty on three terrorism charges for which Moussaoui was eligible for execution. A unanimous vote on any one of them would have resulted in a death sentence.The foreman said deliberations reached a critical point on the third day, when the process nearly broke down. Frustrations built because of the repeated 11 to 1 votes on one charge without any dissenting arguments during discussions. All the ballots were anonymous, and the other jurors were relying on the discussions to identify the holdout.