To say that CBS' casting moves involving Criminal Minds stars A.J. Cook and Paget Brewster drew considerable criticism from the show's fan base is an understatement.

With Brewster's presumed swan song set for next week - an episode in which the previously written-off Cook returns - speculation is rampant over what will transpire.

Her storyline was unfolded ominously for weeks, with Ian Doyle tracking her down and looking for revenge. but will Criminal Minds go so far as to kill off Prentiss?

Or will her exit be more open-ended, as we saw with J.J.'s farewell?

Prentiss (Brewster) and Morgan (Shemar Moore) in the March 2 episode.

CBS' official stance has been that should Paget Brewster be so inclined, she is welcome to return to the cast next fall. But whether she accepts their terms is unclear.

What do you think will send Emily packing? Matthew Gray Gubler, who plays Reid and directed the episode, tells TV Guide that Prentiss' dirty laundry will be aired.

"[Prentiss] finds herself in a tricky situation. She may have done some things in her past that wouldn't be looked upon favorably," Brewster's co-star says.

Comments and theories are welcomed below.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.