: By the end of the season, Jennifer Love Hewitt and A.J. Cook (temporarily) exit the show due to their real-life pregnancies .

: Jennifer Love Hewitt joins the cast as Kate Callahan , an undercover agent who becomes a permanent member of the BAU for the duration of the season .

: The episode "Nelson's Sparrow" (Episode 13) commemorates 10 years of the show. It includes flashbacks to a younger Rossi and Gideon working on a case together . Personal Character Arcs :

continues to process trauma from her previous abduction in the episode "The Forever People" .

undergoes physical and mental recovery after being shot in the neck .