An Islamist video released Sunday said the Sunni radical group Islamic State had beheaded a captured American aid worker, Abdul-Rahman Kassig.
In the video, a masked militant stands over a severed head said to be that of Kassig, BBC reported.
The aid worker was earlier known as Peter Kassig before he converted to Islam. He was kidnapped in Syria last year.
Between August and October this year, the Islamic State has beheaded American-Israeli journalist Steven Sotloff, British aid worker Alan Henning, American journalist James Foley and British aid worker David Haines.
