On Wednesday's episode of Criminal Minds, the members of Behavioral Analysis Unit — and viewers — will say goodbye to Agent Jennifer Jareau.
JJ's exit comes after CBS abruptly let A.J. Cook go for creative reasons during the break between seasons.
And while the plan is ultimately to bring in a new team member, don't look for it anytime soon. "The team has a choice to replace her or not. That's one of the surprises that people don't know about," Mirren says. "Our family has lost a member, and they're irreplaceable. But also somebody has to do that job [as communications liaison]."
"Even if they were to bring somebody else on in the future, the space left by her character is obviously never going to be filled," Gibson adds. "We miss her a lot, and we were lucky to have the time with her when we did."
Criminal Mind airs Wednesdays at 9/8c on CBS.