Step 1 : Introduction to the question "Which professional football player was killed in the War on Terror in 2004?"
Born on this day in 1976, Pat Tillman was a football player in the NFL who left his sports career and enlisted in the military in the aftermath of the September 11 attacks. Tillman turned down a three-year, $3.6 million contract with the Arizona Cardinals to enlist in the U.S. Army. Tillman was killed in Afghanistan in 2004. The official story was that he was shot by enemy forces during an ambush, but it was later revealed that he may have been killed by friendly fire. In addition to his Purple Heart and Silver Star medals from the military, Tillman's number for the Arizona Cardinals was retired in his honor.