The White House confirmed the death of U.S. aid worker Peter Kassig, according to The Associated Press.
The news came after militants released a video Sunday claiming Kassig had been killed. The video showed the aftermath of the beheading. Earlier reports could not identify the victim or confirm the death.
Kassig, 26, did aid work in Syria. Kassig had gone to the Middle East as a soldier and went back as a medical worker. Prior to the confirmation, the United States condemned the attack, according to CNN.
"If confirmed, we are appalled by the brutal murder of an innocent American aid worker and we express our deepest condolences to his family and friends," National Security Council spokeswoman Bernadette Meehan said according to CNN.
Kassig is the fifth Westerner that ISIS beheaded, according to CNN.
President Barack Obama made the following statement regarding Kassig's death:
Today we offer our prayers and condolences to the parents and family of Abdul-Rahman Kassig, also known to us as Peter. We cannot begin to imagine their anguish at this painful time.
Abdul-Rahman was taken from us in an act of pure evil by a terrorist group that the world rightly associates with inhumanity. Like Jim Foley and Steven Sotloff before him, his life and deeds stand in stark contrast to everything that ISIL represents. While ISIL revels in the slaughter of innocents, including Muslims, and is bent only on sowing death and destruction, Abdul-Rahman was a humanitarian who worked to save the lives of Syrians injured and dispossessed by the Syrian conflict. While ISIL exploits the tragedy in Syria to advance their own selfish aims, Abdul-Rahman was so moved by the anguish and suffering of Syrian civilians that he traveled to Lebanon to work in a hospital treating refugees. Later, he established an aid group, SERA, to provide assistance to Syrian refugees and displaced persons in Lebanon and Syria. These were the selfless acts of an individual who cared deeply about the plight of the Syrian people.
ISIL's actions represent no faith, least of all the Muslim faith which Abdul-Rahman adopted as his own. Today we grieve together, yet we also recall that the indomitable spirit of goodness and perseverance that burned so brightly in Abdul-Rahman Kassig, and which binds humanity together, ultimately is the light that will prevail over the darkness of ISIL.