U.S. Ambassador to Libya John Christopher Stevens is the eighth American ambassador to die in the line of duty since 1950. Here are the others.
John Christopher Stevens, in Libya -- Sept. 11, 2012 Stevens was a career diplomat and Arabic speaker known for his smile and determination. He and three other Americans were slain in an attack upon the U.S. Consulate in the eastern Libyan city of Benghazi. Ben Curtis/AP Buy Photo