JACK AND GRISSOM CONTINUE THEIR MAN HUNT FOR A SUSPECTED SERIAL KILLER, ON "WITHOUT A TRACE," THURSDAY, NOV. 1

William Petersen ("CSI: Crime Scene Investigation") Guest Stars as Gil Grissom

This Episode is the Second Chapter of a Two-Part Episode which Began on "CSI: Crime Scene Investigation"

"Where & Why" - Continuing where "CSI: Crime Scene Investigation" left off, the FBI team and Gil Grissom search for a pattern which will help them capture a suspected killer, on WITHOUT A TRACE, Thursday, Nov. 1 (10:00-11:00 PM ET/PT) on the CBS Television Network.

SERIES REGULARS:

Jack Malone: Anthony LaPaglia
Samantha Spade: Poppy Montgomery
Vivian Johnson: Marianne Jean-Baptiste
Danny Taylor: Enrique Murciano
Martin Fitzgerald: Eric Close
Elena Delgado: Roselyn Sanchez

GUEST CAST:

Gil Grissom: William Petersen
Terry: John Hawkes
Kobe Farentino: Nathan Gimble
Gina Farentino: Sarah Danielle Madison
Sylvia Wicker: Amy Stewart
Lucy: Adriana Demeo
Roxi: Jenica Bergere
Dr. Ron Forsythe: Ken Lerner
Thomas Michna: Darryl Alan Reid
Mr. Polcheck: David Kelsey
Anjelica: Uly Tinoco
Anjelica's mother: Estrella T. Tamez
Uni: Omar Adam
Sheriff: Matt McTighe
State Trooper: Austin Priester

WRITTEN BY: Jan Nash and Greg Walker, two of the series' executive producers

DIRECTED BY: Jonathan Kaplan

RATING: To Be Announced