Via Times of Israel:

An Islamic State affiliate group Tuesday published a brutal video that showed terrorists forcing a prisoner in the Sinai Peninsula accused of being an Israeli spy to dig his own grave before executing him.

The video was disseminated by Sinai-based Ansar Bayt al-Maqdis, which is fighting an insurgency against the Egyptian government that recently swore allegiance to the Islamic State terror group.

The prisoner, dawning an orange jumpsuit similar to prisoners held elsewhere by IS affiliates, had been accused of spying on behalf of the Israeli Mossad spy agency. […]

The clip is highly stylized in a fashion that has become a hallmark of Islamic State propaganda videos. The moments before his ultimate execution are shown in slow motion before a gunman suddenly comes up behind the kneeling captive and shoots him in the back of the head.