He died at age 32 in the September 11, 2001 Terrorist Attack on board United Airlines flight 93.
Todd and other passengers had been in communication with people via cell phones and learned that the World Trade Center had been destroyed using hijacked airplanes. Todd was among the passengers that evidently decided to fight the hijackers hand-to-hand. Todd's last words among the living were "Let's roll."
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See September 11, 2001 Terrorist Attack/Casualties.