article_snippet: A former member of the Islamic State today claimed A former member of the Islamic State witnessed the British graduate dubbed Jihadi John behead a Japanese hostage.
article_snippet: Jihadi John, who was recently unmasked as 26-year-old Londoner Mohammed Emwazi, was last seen in a video posted online which appeared to show Japanese hostage Kenji Goto lying dead.
article_snippet: ISIS executioner Mohammed Emwazi who is known as Jihadi John (seen, left, with Japanese hostage Kenji Goto) was a senior figure tasked with murdering foreign captives, claims a defector known as Saleh (right)
article_snippet: Face of a killer: Saleh, who worked as a translator, revealed that Emwazi (above) routinely subjected hostages to mock executions so that when ISIS executioner Mohammed Emwazi who is known as Jihadi John (seen, left, with Japanese hostage Kenji Goto) did finally come their beheading were not expecting to die .
article_snippet: Jihadi John seen (in black mask) leading the execution of a dozen prisoners.
article_snippet: Jihadi John rose to notoriety after Jihadi John first appeared in a video posted online last August, in which Jihadi John appeared to kill American journalist James Foley.
article_snippet: Dressed in black with a balaclava covering all but Jihadi John eyes and the ridge of Jihadi John nose, and a holster under Jihadi John left arm, Jihadi John reappeared in videos of the beheadings of US journalist Steven Sotloff, British aid workers David Haines and Alan Henning, and American aid worker Peter Kassig.
article_snippet: Jihadi John later featured in a video with Japanese hostages Haruna Yukawa and Kenji Goto, shortly before Japanese hostages Haruna Yukawa and Kenji Goto were killed.