Tomislav Salopek, a Croatian man employed by French petroleum geosciences firm CGC has reportedly been beheaded by ISIS-affiliated militants in Egypt’s Sinai peninsula, the Independent reported.

Salopek was kidnapped on his way to work in Cairo in late July by militants with reportedly strong Bedouin accents. The militant group Sinai State claimed responsibility for the kidnapping and demanded that “Muslim female prisoners held by Egypt be released.”

Sinai State pledged allegiance to ISIS in November of 2014. According to the Wall Street Journal, Sinai State said in the tweet that Salopek was killed because “his government and the infidel Egyptian government abandoned him.”

This is believed to be the first time that Sinai State has executed a hostage.

Egypt’s Interior Ministry confirmed that it has seen the video released by the group that purportedly shows the body of Salopek and that it is working to confirm its authenticity. Salopek is survived by a wife and two children.