Confirmation of Abdul-Rahman (Peter) Kassig's death came after a review of a video released Sunday by the Islamic State that purported to show extremists beheading several Syrian soldiers, and concluded with a militant claiming to have killed the American.
Death of an American by Islamic State Militants

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Abdul-Rahman (Peter) Kassig, an American aid worker, making a food delivery to refugees in Lebanon’s Bekaa Valley, May 2013. (Copyright, with permission to use from Kassig family)

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Abdul-Rahman Kassig is shown in a Kassig family photo somewhere along the Syrian border between late 2012 and autumn 2013, helping Special Emergency Response and Assistance (SERA) deliver supplies to refugees.

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This undated photo shows Peter Kassig leaning against a truck at an unknown location.

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Abdul-Rahman (Peter) Kassig (center) helps push an ambulance up a hill during his time working with SERA. Photo taken near Deir Ezzor, August 2013. (Copyright, with permission to use from Kassig family)