THE BAU FACES ONE OF ITS TOUGHEST CASES YET WHEN A PROLIFIC, BORDER-CROSSING SERIAL KILLER LEADS THEM ON A HUNT INTO CANADA, AND AN AGENT'S LIFE IS IN PERIL, ON THE TWO-HOUR, FOURTH SEASON FINALE EVENT OF "CRIMINAL MINDS," WEDNESDAY, MAY 20

"To Hell.And Back" - The BAU 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 (8:00-10:00 PM, ET/PT) on the CBS Television Network.

PART ONE WRITTEN BY: Chris Mundy, one of the series' co-executive producers

PART ONE DIRECTED BY: Charles Haid

PART TWO WRITTEN AND DIRECTED BY: Series Executive Producer Edward Allen Bernero

SERIES REGULARS:

David Rossi: Joe Mantegna
Aaron Hotchner: Thomas Gibson
Emily Prentiss: Paget Brewster
Derek Morgan: Shemar Moore
Dr. Spencer Reid: Matthew Gray Gubler
Jennifer Jareau: A.J. Cook
Penelope Garcia: Kirsten Vangsness

GUEST CAST:

William Hightower: Sharif Atkins
Charles Porter: Christopher Guckenberger
Motel Clerk: Scott Lincoln
Border Agent #1: Brandon Taylor
Border Agent #2: Gavin McClure
Officer Jeff Bedwell: John Lacy
Daniel: Jessie T. Usher
Sheri the Hooker: Erin Anderson
Unsub: Paul Rae
Det. Benning: Rowena King
Maxine Hightower: Vernee Watson
Walter Patterson: William Belli
Vicki: Krystal Marshall
Kelly: Lily Kershaw
Mason Turner: Garrett Dillahunt
Burt Lang: Benjamin Byron Davis
Constable Cassar: Casey Nelson

RATING: To Be Announced