Anwar_al-Awlaki who was an American citizen who was killed by the obama administration without a trial. They recently came out and stated that "due process" does not mean "judicial process". Due process is whatever they decide it is. It set a precedent for the government killing American citizens without a trial. Another direct quote "If we can kill an American citizen in Yemen, I don't know why we couldn't do it in Iowa."
Was he a terrorist? Almost certainly. But who is to decide these things? It's a sad day when the government can be judge, jury and executioner for it's own citizens.
Open Channel - Can U.S. legally kill a citizen overseas without due process?