A member of a group of Islamic State (ISIS) militants who beheaded American hostages in Iraq and Syria, and were nicknamed “The Beatles” for their British accents, was found guilty of terrorism offenses in a U.S. court on Thursday.

A jury found El Shafee Elsheikh, 33, guilty on all counts following a trial in Alexandria, Virginia, just outside Washington, on charges including lethal hostage-taking and conspiracy to commit murder.

The charges against Elsheikh, a former UK citizen, carry a potential death sentence, but U.S. prosecutors have advised British officials that they will not seek the death penalty.