The parents of an American aid worker beheaded by Islamic State militants after his abduction in Syria said they would make a brief public statement at their Indianapolis church on Monday. Abdul-Rahman Kassig, whose name was Peter before his conversion to Islam, was the fifth European or American captive killed by the militants, and his severed head was seen in a video released on Sunday that showed the beheadings of at least 14 men. In early October, Islamic State had threatened that Kassig, 26, a medic and former U.S. Army Ranger, would be the next American or European captive the group would behead after killing British aid worker Alan Henning.