He is a 20-stone savage who has amassed a bloody reputation as one of ISIS's most unsightly executioners. The obese extremist known only as 'The Bulldozer' has beheaded unarmed men and amputated young children as part of the terror group's so-called 'Chopping Committee'. And just like Jihadi John, the ISIS executioner who was eventually unmasked as Mohammed Emwazi, the coward has never dared to show his face on camera.