Guy is executed with several AK-47 shots by Sunni extremists. He belongs to a religious group known as the Alawites. It is a small religious group that is active mainly in Syria and is based on the Shiite strand of Islam. They combine elements of Islam and Christianity. Instead of the Prophet Mohammed, they worship his cousin and son-in-law Ali.
The tension between the Sunnis and the Alawites stems from a long history. Sunnis believe that the Quran is the immutable word of God and cannot be interpreted otherwise. Thus, they consider the Alawites to be a kind of sect that blasphemes against their religion.
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https://en.wikipedia.org/wiki/Alawites