An Islamic State leader who was involved in the killing of a former U.S. Army Ranger was killed Sunday in Syria, the U.S.-led coalition combating ISIS said.

Abu al Umarayn, a senior member of ISIS, and other members of the terrorist group were killed in precision drone strikes in the Badiyah Desert, Col. Sean Ryan, a spokesman for the U.S.-led coalition, said, according to reports.

“Al Umarayn had given indications of posing an imminent threat to Coalition Forces and he was involved in the killing of American citizen and former U.S. Army Ranger Peter Kassig,” Ryan said. “He has been linked to and directly involved with executing several other prisoners as a senior ISIS member."

Kassig, 26, enlisted in the Army in 2004 and was medically discharged in 2007. He was abducted in Syria in October 2013 while providing aid to refugees fleeing the country. A graphic video released in 2014 showed Kassig beheaded by members of the Islamic State, after which U.S. officials confirmed its authenticity.