Port Authority of New York and New Jersey Police Department, New York
End of Watch: Tuesday, September 11, 2001
Age: 44
Tour of Duty: 22 years
Badge Number: 899
Cause of Death: Terrorist attack
Date of Incident: September 11, 2001
Weapon Used: Aircraft; Passenger jet
Suspect Info: 19 suicide attackers
Officer Liam Callahan was killed in the September 11, 2001, terrorist attacks while attempting to rescue the victims trapped in the North Tower of the World Trade Center.
The officer had served with the Port Authority of New York and New Jersey Police Department for 22 years.