'He Was Thinking About You Until the Very End': 9/11 Survivor Finally Delivers Father's Last Message to His Sons

On September 11, 2001, firefighter Bill Spade made it out alive, while police officer John D’Allara tragically died as the building collapsed on him (Credit: National Geographic/Virginia Sherwood)

He survived as the only firefighter from his rescue company on 9/11, but waited nearly 25 years to deliver a fallen police officer's final message to his sons: their father 'was thinking about you until the very end'.

Now, in a new National Geographic documentary, '9/11: Reunited', Spade sits down with the sons of NYPD officer John D'Allara to tell them what their father said and did in his last moments inside the North Tower.