John Patrick O'Neill ( February 6 , 1952September 11 , 2001 ) was an American counter-terrorism expert , who worked as a special agent and eventually a Special Agent in Charge in the Federal Bureau of Investigation . In 1995 , O'Neill began to intensely study the roots of the 1993 World Trade Center bombing after he assisted in the capture of Ramzi Yousef , who was the leader of that plot
1993 World Trade Center bombing
1993 World Trade Center bombing
John P. O'Neill