Justice for 9/11 Act This bill provides that any plea agreement entered into by Khalid Shaikh Mohammad, Walid Muhammad Salih Mubarak Bin ‘Attash, or Mustafa Ahmed Adam al Hawsawi for actions involving the terrorist attack on September 11, 2001, and its related judgment must not preclude the trial of such individuals under other provisions of law for that attack. In any trial of such individuals, the death penalty must be available. In the case of any sentence imposed on Khalid Shaikh Mohammad, Walid Muhammad Salih Mubarak Bin ‘Attash, or Mustafa Ahmed Adam al Hawsawi, the individual must (1) be held at U.S. Naval Station, Guantanamo Bay, Cuba, in solitary confinement; (2) not be provided contact with foreign nationals; (3) not be provided with psychological treatment except that specifically authorized by medical authorities at Guantanamo Bay; and (4) not be transferred to the continental United States or any other country.