"/>  The former US Armyanger Peter Kassig, pictured here, was captured in Syria in 2013. The US leadership said…
Abu al Umarayn, a leading ISIS leader involved in the brutal murder of former US Armyanger Peter Kassig was killed in a drone strike in Syria on Sunday, said the US leadership .
The leader along with “several other ISIS members” was killed in precision drone strikes in Syria Badiyah Desert, coalition advocate coal. Sean Ryan said in a statement.
“Al Umarayn had given indications of pervasive threats to the coalition forces, and he was involved in the killing of American citizens and former US Armyanger Peter Kassig,” officials said. “He has been linked to and directly involved in performing several other prisoners as senior ISIS members.”
FLASHBACK: PETER BUSINESS, Former Army Ranger held by Isis, went to Lebanon to help with Syria waste  The statement continued: “Coalition airstrikes continue to interfere with the ISIS command and control on the battlefield when we take delete key figures from their joints. “
Kassig, a 26-year-old auxiliary worker and American citizen, was captured in Syria in October 2013 as he gave help to Syrians fleeing the civil war of the country. His friends say he converted to Islam in captivity and took the name of Abdul-Rahman. ISIS released graphic video in 2014 and showed that he was beheaded and American officials confirmed that the film was authentic.
He arrived in the 2004 army and became a Ranger, who eventually served in the 75th Ranger Regiment, a military special operation unit, according to his military record. Censored was trained at Fort Benning, Geor Gia, 2006, and deployed to Iraq from April to July 2007. He was released medical in the rank of private first class in September 2007.
2014 GRAPHIC ISLAMIC STATE GROUP VIDEO CLASS US AID WORKER PETER BAD BEHEADED
In a January 2013 interview with Time, Kassig said that he traveled heavily throughout Lebanon to assess people’s needs there.
Critically formed emergency assistance and help organization or SERA in Turkey to provide help and assistance to Syrian refugees. He started supplying food and medical supplies to Syrian refugee camps in 2012 and is also a trained medical assistant who provided trauma care to injured Syrian civilians and helped train 150 civilians to provide medical assistance.
Fox News Lucas Tomlinson and Associated Press contributed to this report.