Jennifer Love Hewitt on March 4, 2013, in New York. CBS says Hewitt is joining the cast of "Criminal Minds" in fall 2014. She will play Kate Callahan, a seasoned undercover agent whose superior work at the FBI has earned her a place in the Behavioral Analysis Unit.

Dan Hallman / Invision / AP

Jennifer Love Hewitt on March 4, 2013, in New York. CBS says Hewitt is joining the cast of "Criminal Minds" in fall 2014. She will play Kate Callahan, a seasoned undercover agent whose superior work at the FBI has earned her a place in the Behavioral Analysis Unit.