WASHINGTON—An alleged member of a group of ISIS terrorists that beheaded American hostages in Iraq and Syria, nicknamed “The Beatles” for their British accents, faces a U.S. criminal trial beginning on Tuesday. El Shafee Elsheikh, 33, will stand trial in federal court in Alexandria, Virginia, just outside Washington, on charges including lethal hostage-taking and conspiracy to commit murder. Elsheikh was one of four ISIS militants belonging to the four-member ISIS cell. The cell garnered international attention after releasing videos of the murders of U.S. journalists James Foley and Steven Sotloff and aid workers Kayla Mueller and Peter Kassig, among other victims. Two of the cell’s four members, Elsheikh and Alexanda Kotey, were held in Iraq by the U.S. military before being flown to the United States to face trial. Mohammed Emwazi, a British citizen who oversaw the executions, died in a drone strike in 2015. Aine Lesley Davis, the fourth …