He was an assassin with a 100% success rate. His specialty was framing other criminals. Ressler noted that John X was a mythical as the Tooth Fairy. Navabi noted that Mossad called him John Shadow, the criminal’s boogeyman. Suspects have claimed that their victims were killed by a shadow with yellow eyes. They claimed they were framed, but law enforcement always dismissed the claims as attempts for insanity pleas. No one had been able to prove that he actually existed.