A member of the brutal Islamic State cell dubbed in the media as “The Beatles” has pleaded guilty to all charges against him relating to the hostage-taking of four slain Americans, the US Justice Department said Thursday.

Federal prosecutors say British-born Alexanda Kotey took part in the seizure, detention and hostage negotiations of four US citizens — journalists James Foley and Steven Sotloff and aid workers Peter Kassig and Kayla Mueller — each of whom died in IS captivity. The indictment also accuses Kotey of participating in hostage operations involving several European nationals. 

In a Virginia courtroom on Thursday, Kotey pleaded guilty to all of charges listed in the eight-count indictment, including hostage-taking resulting in death, conspiracy to commit murder of Americans abroad and conspiracy to provide material support or resources to terrorists.  

“This guilty plea ensures that Kotey will spend the rest of his life in prison for the horrific crimes he has committed,” Mark J. Lesko, acting assistant attorney general for the Justice Department’s National Security Division, said in a statement.