You'll surely remember last year's hit, "Bureau of Prisons Misplaces Psychopathic Cartel Hitman:"

Well, get ready for the sequel, "Bureau of Prisons II: Where's The Islamic Terrorist?"

The notorious terrorist and member of the ISIS cell dubbed "The Beatles," who was serving a life sentence for the kidnap, torture and murder of western journalists and aid workers in Syria, has disappeared from the Federal Bureau of Prisons (BOP), Fox News Digital confirmed Thursday.

And yes, we do need to stress that this guy isn't in jail for, like, attempting a bombing, or conspiring with hostile foreign powers, or anything relatively benign. He is one. Bad. Dude:

The U.S. Justice Department in April said Kotey and his three partners participated in the "seizure, detention and hostage negotiations" of four Americans, including James Foley, Kayla Mueller, Steven Sotloff and Peter Kassig, along with 23 others between 2012 -2015.

It seems kind of important that this guy should be (a) in custody, and (b) listed as in custody, so we can be assured that they're not, you know, at large and an imminent national security threat or something. And yet the Bureau of Prisons is being kinda blasé about all of this:

In a statement to Fox News Digital, [BOP spokesman] Randilee Giamusso said, "Inmates who were previously in BOP custody and who have not completed their sentence may be outside BOP custody for a period of time for court hearings, medical treatment or for other reasons."

Yeah...

To be fair, the daughter of one of Kotey's victims has been "assured by U.S. Justice sources that Kotey is still detained in the U.S." So thats comforting.

Then again, it's been over a month since the cartel hitman was listed as out of BOP custody, and as of Friday he is still very much listed that way on the bureau's website:

I think we all want to know: