A German rapper turned Islamic State fighter who reportedly married the FBI translator hired to spy on him has been killed in an air strike in Syria, a US-based monitoring group has said.

Denis Cuspert, who performed under the stage name Deso Dogg, became one of the group’s most famous Western fighters, appearing in numerous propaganda videos including one that apparently pictured him with a man’s severed head.

The German-Ghanaian was killed on Wednesday during an air strike in the town of Gharanij in Syria’s Deir Ezzor province, according to a statement from the pro-IS Wafa’ Media Foundation translated into English by the SITE monitoring group.

The militant group also posted eight graphic photographs on the Telegram messaging app that it said were of his bloody corpse, SITE said.

Cuspert’s death has been reported before, including by the Pentagon which announced he had been killed in an air strike in Syria in October 2015. It later acknowledged he appeared to have survived the attack.

Militant sources in April 2014 also said Cuspert had been killed in Syria but they later retracted the claim.