Deso Dogg, a German rapper who became a notorious militant for the Islamic State, has reportedly been killed in Syria.

The U.S.-based monitoring group SITE Intelligence announced the news earlier this week, citing a pro-Islamic State propaganda news site that posted graphic images of Deso’s corpse. According to the Daily Mail, the Berlin-born terrorist was killed Wednesday during an airstrike in the town of Gharanij in eastern Syria.

Deso—birth name Denis Cuspert—reportedly joined ISIS in 2012 and went on to appear in numerous propaganda videos for the jihadist militant group, including one in which he appeared to be holding a severed head. In 2014, he married FBI agent Daniela Greene, who allegedly “grew attached” to the rapper-turned-militant after she was assigned to spy on him. Shortly after their marriage, Greene fled Syria and returned to the U.S., where she pleaded guilty to lying to investigators, according to the Telegraph.

“I was weak and didn't know how to handle anything anymore, she said prior to leaving the Middle East. “I really made a mess of things this time.”

Greene served less than two years behind bars.

This isn’t the first time Deso’s death has been reported. In April of 2014, Jihadist sources announced he had been killed in Syria; however, the sources later took back the claim. In October of 2015, the Pentagon announced he was killed in an airstrike in Syria, but the Department of Defense retracted the report after it acknowledged he appeared to have survived the attack. 

Before he abandoned his music career, Deso released several projects and had toured with DMX in 2005 and 2006.