There will be major changes on "Criminal Minds" when the long-running police drama kicks off its 11th season on CBS in the fall.

Earlier this year, executive producer Erica Messer confirmed that Jennifer Love Hewitt will not reprise her role as FBI Undercover Agent Kate Callahan next season since she is pregnant in real life and is taking time off to spend with her new baby.

In addition, series star AJ Cook revealed that she, too, is pregnant during the Season 10 finale. As a result, JJ, will be taking maternity leave and won't be featured in the first couple of episodes of Season 11.

As a result, the show has cast veteran actress Aisha Tyler as the newest member of the Behavioral Analysis Unit team to help fill in the empty spaces that Hewitt and Cook have left on the drama series.

Tyler will play the reoccurring role of Dr. Tara Lewis, a forensic psychologist who Aaron "Hotch" Hotchner determines is the best candidate for Kate Callahan's vacated position, Entertainment Weekly reports.

According to EW, Dr. Lewis' "dream was to study psychopaths up close and personal -- and her psychology background, combined with her experience in the FBI, brought her face-to-face with monsters. Her job was to stare them down and interview them, in order to determine if they were fit to stand trial. In the process, she made herself find the humanity inside these broken men (and, sometimes, women) in order to learn if there was a conscience behind their brutal crimes."

As of now, it is unclear whether Tyler is signing on to replace Hewitt or simply fill in during Cook's absence.

In addition to voicing Agent Lana Kane on "Archer," Tyler co-starred with Hewitt on "Ghost Whisperer" and is currently a co-host on "The Talk," notes TVGuide.