His beheading is believed to have taken place in Hama in Syria.
ISIS is increasingly using propaganda to encourage would-be terrorists and spread fear among those working against ISIS in Iraq and Syria.
It follows a video released by ISIS which week that warns 'America will burn' and threatens a repeat of the 9/11 atrocity that saw the twin towers destroyed.
The 11-minute video features some of the group's most brutal killings - such as the beheading of American journalist James Foley and the brutal burning of Jordanian pilot Muadh al-Kasasbeh as he stood in a cage.
The twin towers and still images of Osama bin Laden are also shown during the short video.
Propaganda is increasingly being used by ISIS as a way of attracting new recruits and gaining notoriety.
The latest photographs follow a video released last month which show eight suspected informers, all dressed in red jumpsuits, being executed.