HORATIO AND DELKO VOW PERSONAL REVENGE ON A KILLER AND THE DEPARTMENT'S MOLE IS FINALLY EXPOSED, ON THE FOURTH SEASON FINALE OF "CSI: MIAMI," MONDAY, MAY 22

Scenes Shot on Location in Miami

"One of Our Own" -- Horatio and Delko vow personal revenge on a murderer and the lab's mole is finally exposed, on the fourth season finale of CSI: MIAMI, Monday, May 22 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Matt Earl Beesley directed the episode written by Barry O'Brien and Krystal Houghton from a story by Co-Executive Producer Elizabeth Devine.

Horatio and Delko search Miami to bring down the Mal Noche gang once and for all after the murder of someone very close to them. However, their quest is jeopardized when the Feds seize the CSI lab with the intent to close it for good, based on the tip from the mole inside. When the mole is finally revealed to the entire lab, the news sends the remaining CSIs reeling.

Horatio Caine: David Caruso
Calleigh Duquesne: Emily Procter
Eric Delko: Adam Rodriguez
Alexx Woods: Khandi Alexander
Ryan Wolfe: Jonathan Togo
Det. Frank Tripp: Rex Linn
Natalia Boa Vista: Eva LaRue
Marisol Delko: Alana De La Garza
Valera: Boti Bliss
Officer Jessop: Joel West
Antonio Riaz: Vincent Laresca
Peter Elliott: Michael B. Silver
Aaron Peters: Armando Valdez-Kennedy
Dan Cooper: Brendan Fehr
Monica West: Bellamy Young
Memmo Fierro: Robert LaSardo
David Park: Lance Reddick
Agent Glen Cole: Mark Rolston
Special Agent Perry: Eric Mabius
Carlos Alvarez: Kevin Alejandro
Rafik Omad: David Ackert
Agent Heather Landrey: Dahlia Salem
Male Agent: Jonathan Strait

RATING: To Be Announced