GRISSOM AND HIS TEAM TRY TO PIECE TOGETHER WHAT HAS BECOME OF A HIGH SCHOOL BASKETBALL STAR AND HIS CHEERLEADER GIRLFRIEND WHO DIDN'T RETURN HOME AFTER A BIG GAME, ON "CSI: CRIME SCENE INVESTIGATION," THURSDAY, FEB. 22, 9:00-10:00 PM, ET/PT

Tony Award Nominee Valarie Pettiford ("Fosse," "Half & Half"), Matt Lanter ("Shark," "Heroes") And Laura Harris ("Dead Like Me," "24") Guest Star

"Fallen Idols" -- Grissom and his team are discouraged when they find a pool of blood as they begin investigating the disappearance of a high school basketball star and his cheerleader girlfriend, on CSI: CRIME SCENE INVESTIGATION, Thursday, Feb. 22 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Chris Leitch directed the episode written by Marlane Meyer, the series' consulting producer.

Tony Award nominee Valarie Pettiford ("Fosse," "Half & Half"), Matt Lanter ("Shark," "Heroes") and Laura Harris ("Dead Like Me," "24") guest star, respectively, as the mother of the missing Megan's best friend, Megan's missing boyfriend, Ryan, and Ryan and Megan's photography teacher, Diane Kentner.

Grissom's quip that the young lovers may have run off to Mexico is soon quashed by the discovery of drops of blood by Ryan's (Lanter) vacant parking spot at the school. After finding a letterman jacket and cheerleading sweater in the field house and a pool of Ryan's blood nearby, the team tries to determine what went awry.

SERIES REGULARS:

Gil Grissom: William Petersen
Catherine Willows: Marg Helgenberger
Warrick Brown: Gary Dourdan
Nick Stokes: George Eads
Captain Jim Brass: Paul Guilfoyle
Sara Sidle: Jorja Fox
Greg Sanders: Eric Szmanda
Dr. Robbins: Robert David Hall
Sofia Curtis: Louise Lombard
Hodges: Wallace Langham

RECURRING CAST:

Officer Mitchell: Larry Mitchell
Archie Johnson: Archie Kao
Wendy Simms: Liz Vassey

GUEST CAST:

Charlie Kellerman: Reiley McClendon
Megan Cooper: Lyndsy Fonseca
Ryan Lansco: Matt Lanter
Sheila Latham: Yaani King
Diane Kentner: Laura Harris
Brenda Cooper: Bridget Ann White
Sam Cooper: Matt Roth
Eddie Lansco: Todd Allen
Linda Lansco: Timi Prulhiere
Susan "Sue" Latham: Valarie Pettiford

RATING: TV-14-DV