Question: What was the official position of this American career diplomat who died during the attack in which Ahmed Abu Khattala participated in 2012?
Sentence (from "J. Christopher Stevens"): John Christopher Stevens (April 18, 1960 – September 11, 2012) was an American career diplomat and lawyer who served as the U.S. Ambassador to Libya from May 22, 2012 to September 11, 2012.
Relevant evidence: Yes