ÃÂAnnihilatorÃÂ ÃÂ The FBIÃÂs Assistant Director of National Security, Linda Barnes (Kim Rhodes), joins the BAU as they investigate a quadruple homicide of a group of roommates in St. Louis, on CRIMINAL MINDS, Wednesday, March 7 (10:00-11:00 PM, ET/PT) on the CBS Television Network.    Pictured: Aisha Tyler (Dr. Tara Lewis), Joe Mantegna (David Rossi), Daniel Henney (Matt Simmons), Kim Rhodes (Assistant Director Linda Barnes), Detective Shannon Morris (Rachel Quaintance), Adam Rodriguez (Luke Alvez)   Photo: Best Screen Grab Available ÃÂ©2018 CBS Broadcasting, Inc. All Rights Reserved