NCIS GETS A NEW LEAD IN THE ONGOING MOLE INVESTIGATION AFTER TWO MEN ARE KILLED BY AN UNKNOWN ASSAILANT IN FRONT OF CALLEN'S HOUSE, ON A REBROADCAST OF "NCIS: LOS ANGELES," SUNDAY, JUNE 4

Editor's note: This episode replaces a previously scheduled episode.

"Sirens" - After an unknown female assailant kills two men disguised as sheriff's deputies in front of Callen's home, the NCIS team gets a new lead in the ongoing mole investigation. Also, Nell visits a prison to interview an inmate withholding information on the department's leak, on a rebroadcast of NCIS: LOS ANGELES, Sunday, June 4 (10:00-11:00 PM, ET/PT) on the CBS Television Network. (Originally broadcast 11/27/16.)

REGULAR CAST:

Chris O'Donnell (Special Agent G. Callen)
LL COOL J (Special Agent Sam Hanna)
Linda Hunt (Henrietta "Hetty" Lange)
Daniela Ruah (Special Agent Kensi Blye Eric Christian Olsen (LAPD Detective Marty Deeks)
Barrett Foa (Tech Operator Eric Beale)
Renée Felice Smith (Intelligence Analyst Nell Jones)
Miguel Ferrer (Assistant Director Owen Granger)

GUEST CAST:

Pamela Reed (Roberta Deeks)
Laura Harring (Julia Feldman)
Adam Bartley (Carl Brown)
Lindsay LaVanchy (Natalie Grant / Amber Wilcox)
Kurt Yaeger (Sullivan)
Chase Kim (Deputy Bennett)
Nate Hartley (Vinny)
Dustin Fasching (Bartender)
Shon Lange (LA County Sheriff / Dexter Frazier)
Gretchen Palmer (Heather / Rae)

WRITTEN BY: Erin Broadhurst

DIRECTED BY: Jonathan Frankes