[WATCH] 'Criminal Minds' Sneak Peek: Garcia Finds out the Gossip About Rossi's Third Ex-Wife

It's all about love and romance in Criminal Minds season 13 episode 18 -- but in (at least) one case, it involves murder. The BAU travels to Chicago in "The Dance of Love" to investigate an UnSub who leaves red roses on each victim.

In other news, Rossi gets an unexpected visit from his ex-wife, Krystall Richards (played by Gail O'Grady), and yes, "with the K and 2 Ls," as Prentiss puts it when she hears she called.