The final episode of Criminal Minds season 6 was titled Supply and Demand. It aired on May 18, 2011, and was directed by Charles S. Carroll and written by Erica Messer.

Criminal Minds Season 7 is a perfect blend of suspense, action, and character moments we've all missed seeing on our screens.

This Seinfeld star's chilling guest role as a serial killer on Criminal Minds is still unsettling viewers over a decade later ...