The United States ambassador to Libya and three embassy staff were killed after a mob stormed the U.S. consulate in the eastern city Benghazi late Tuesday. J. Christopher Stevens, a career U.S. foreign service officer, is one of the most experienced U.S. envoys in the region.
US Ambassador Christopher Stevens

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Then-U.S. envoy J. Christopher Stevens attends meetings at the Tibesty Hotel in Benghazi, Libya. (April 2011 file photo)

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J. Christopher Stevens, newly appointed U.S. ambassador to Libya, shakes hands with Libyan National Transitional Council (NTC) chairman Mustafa Abdel Jalil (R) after presenting his credentials during a meeting in Tripoli, June 7, 2012.

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Then-U.S. envoy Christopher Stevens speaks to local media before attending meetings at the Tibesty Hotel where an African Union delegation was meeting with opposition leaders in Benghazi, Libya. (April 2011 file photo)

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In this photo posted on the U.S. Embassy Tripoli Facebook page, Christopher Stevens poses with a shop owner in Tripoli, Libya, August 12, 2012.