The brave British marksman saved the terrified eight-year-old and his father after taking out the crazed jihadi with a head shot from 1,000 metres away.
The special forces crack shot then killed two other members of the hated terror group, who were also taking part in the sick planned execution.
ISIS militants had decreed that the little boy and his father must die after branding them "infidels" because they refused to denounce their faith.
They were just seconds from death when the hero sniper intervened to stop the barbaric killing in the Syrian desert. The pair were part of the minority Shia sect of Islam which ISIS considers to be heretical.
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