Last night's Criminal Minds season premiere tied up one of the show's most dramatic, compelling story arcs in years, with A.J. Cook's Jennifer Jereau spearheading the effort.

Next week, the show bids farewell to Cook in an episode fittingly titled "J.J." As she tries to reunite a family with a daughter who disappeared, she receives another job offer.

Here's CBS' first preview for next week's installment ...

[video url="http://www.tvfanatic.com/videos/jj-promo/" title="JJ Promo"] [/video]

Are you sad A.J. is departing, and do you think it will upset the balance of this terrific cast? Are you happy she's at least getting a nice sendoff with these episodes? Tell us what you think by commenting below, and click to enlarge some photos from "J.J." as well:

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.