They killed this CIA asset because his cover was blown. Al-Awlaki was tied to the fort hood shooter by numerous emails. He was supposed to be in charge of the shoe bomber, times square bomber, and many other terrorist attacks. The 2 printer cartridge bombs last year were made of the same materials as the shoe bomb and underwear bomb.
Fox news reported that soon after 911 Al-Awlaki dined with top brass at the pentagon.
His cover was blown when Kurt Haskell a witness who was on the plane with the underwear bomber refused government orders to shut up about what he saw. The underwear bomber is now going on trial. Maybe they killed him to try to prove he was not working for the CIA before the trial starts.
The timing of his death is as suspicious as the killing of Osama and the seal team 6 killing on the helicopter.
Recent videos of a Kurt Haskell interview.
http://www.youtube.com/watch?v=unSVzg2bzAU http://www.youtube.com/watch?v=k13P84Kogtc