Thomas Gibson and Jennifer Love Hewitt Thomas Gibson and Jennifer Love Hewitt

CBS's Criminal Minds gets some new blood this fall when Jennifer Love Hewitt joins the cast in the Oct. 1 premiere as agent Kate Callahan.

"Kate is smart, charming, and wise for her years," says executive producer Erica Messer. "Her background is criminal psychology, and her passion comes from wanting to make the world a safe place. She's had a lot of personal loss that makes her a patriot and a nurturing figure to those in her personal and work families."

Callahan, an eight-year FBI vet, is also an old pal of the BAU team and fits right in — just like Hewitt does on set. "The rapport feels like friends catching up," Messer says. "If feels like she's always been here."

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