World ISIS Extremist Who Beheaded Prisoners Is Identified By Dina Temple-Raston Published February 27, 2015 at 4:03 AM CST Facebook Twitter LinkedIn Email Listen • 3:57 Niklas Halle'n / AFP/Getty ImagesA 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." Copyright 2015 NPR