World ISIS Extremist Who Beheaded Prisoners Is Identified By Dina Temple-Raston Published February 27, 2015 at 5:03 AM EST Facebook Twitter LinkedIn Email Your browser doesn’t support HTML5 audio A playground is seen in London, outside an address where Kuwaiti-born London computer programmer Mohammed Emwazi is believed to have lived. Emwazi has been identified as masked ISIS militant "Jihadi John."Niklas Halle'n Copyright 2015 NPR