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ISIS leader involved in murder of US aid worker Peter Kassig killed
[ENGLISH.ALARABIYA.NET] A senior ISIS leader who was involved in the murder of former US Army Ranger Peter Kassig, was killed in a dronezap in Syria on Sunday, Fox News reported citing the US-led coalition said.

Abu al Umarayn
...sometimes spelt Abou al Oumarayn...
is believed to have been involved in the beheading of Kassig, a US aid worker who was kidnapped by ISIS in Oct. 2013 as he was on his way to Deir Ezzour in eastern Syria to deliver food and medical supplies to refugees.
The Times of Israel adds:
Peter Kassig, aged 26 at the time of his death, founded a humanitarian organization in 2012 and adopted the name Abdul Rahman after his conversion to Islam.
Posted by: Fred 2018-12-03
http://www.rantburg.com/poparticle.php?ID=528888