A.J. Cook returning to CBS' 'Criminal Minds' as regular cast

A.J. Cook has signed a two-year deal to return to the CBS drama "Criminal Minds," reports Deadline.com. Before re-joining as a full time cast member, Cook will guest star on the upcoming season finale, airing May 18. The actress left the show after the end of last season after her option was not picked up, but was featured on two episodes early this season in order to wrap up her character's storyline.