Numerous letters and petitions were signed to save JJ and Prentiss by fan all over. Clearly fans don't agree with CBS' decision. Cook filmed her what seemed to be her last episode, Season 6, episode 2 - "JJ". However she returned to Criminal Minds in episode 18 - "Lauren", for Paget Brewster's last episode.
However JJ fans should be pleased at the next return of AJ Cook to Criminal Minds. And this one is permanent. Recently AJ Cook has signed a two year contract back to Criminal Minds.
"JJ's back! Just signed 2 year deal. Excited to work with cast and crew again. Thanks to all of you" Cook tweeted. JJ will return to Criminal Minds on the season 6 finale, and then return for season 7.
Paget Brewster's Criminal Minds future is still uncertain. The actress is working on a new show 'My Life As An Experiment' and if the show is successiful she will continue to work on that. But Criminal Minds producers have an option on her for the show, so she may be returned one day two.
The next worry for Criminal Minds fans is decisions about Morgan (Shemar Moore) and Hotch (Thomas Gibson) have yet to be finalized as both actors haven't signed on for the next season. Deals are currently being made.
Criminal Minds still has an uncertain future. Whats to happen to Rachel Nicholas is still unknown now with Cook returning. But JJ fans can relax that she will be returning.