Say goodbye to Elle, the brunette we barely knew and didn't really care about. She makes her exit in "The Boogeyman", which is otherwise about a short staffed team pursuing a child murderer. Who could it be? Like all Criminal Minds mysteries, it's not that hard to figure out. This episode features early performances by both Elle Fanning AND the guy who played the Joker on Gotham. Truly, Criminal Minds is a repository of talented children.