Photo: Vivian Zink/ABC Studios ©2009 ABC Studios. ALL RIGHTS RESERVED
Criminal Minds: "To Hell...And Back" - The BAU (from left) Shemar Moore, Matthew Gray Gubler, Paget Brewster, and Thomas Gibson) tracks a serial killer who chooses junkies, prostitutes and the homeless off the streets of Detroit as his victims and takes them across the border into Canada, and an agent's life is in peril, on the two-hour, fourth season finale event of CRIMINAL MINDS, Wednesday, May 20 (9:00-11:00 PM, ET/PT) on the CBS Television Network.