PARIS — A high-profile French jihadist and Islamic State propagandist, Fabien Clain, who is believed to have recorded the Islamic State’s claim of responsibility for the November 2015 attacks in Paris, was killed by an airstrike in southeastern Syria, the American-led coalition said on Thursday.

“A Coalition strike killed an active Daesh media official named Abu Anas al Faransi, also known as Fabien Clain, in Baghouz,” the coalition said in a Twitter posting, using the Arabic name for the Islamic State.

Baghouz, also spelled Baghuz, is a village in the last bit of territory in Syria still held by the militant group.

It was unclear when Mr. Clain was killed, but he and his brother, Jean-Michel, were believed to have been targeted by an airstrike on Feb. 20. The defense minister of France, part of the coalition, called his death “possible” the next day. The fate of the brother remains unclear.