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(CNN) - American aid worker and former soldier Peter Kassig was beheaded by ISIS terrorists, the White House confirmed Sunday, hours after a video claiming to show the victim surfaced online.
ISIS held Kassig as a hostage and in previous communications had threatened his life.
The video shows the aftermath of a beheading in which the victim is not clearly recognizable.
President Barack Obama confirmed the 26-year-old's beheading, saying Kassig "was taken from us in an act of pure evil by a terrorist group that the world rightly associates with inhumanity."
Kassig, who converted to Islam in captivity, also went by the name Abdul-Rahman Kassig.