THE NCIS: LOS ANGELES TEAM SEARCHES FOR A SLY CULPRIT IN POSSESSION OF STOLEN CYANIDE AFTER A NAVY LIEUTENANT IS POISONED, ON "NCIS: LOS ANGELES," TUESDAY, APRIL 9

Editor's note: The end time for this episode has been changed.

"Purity" - When cyanide in a communal water jug lethally poisons a lieutenant and leaves a Navy pilot in serious condition, the NCIS: LA team investigates whether this is an isolated incident or an early test for large-scale water contamination, on NCIS: LOS ANGELES, Tuesday, April 9 (9:00-10:01 PM, ET/PT) on the CBS Television Network.

SERIES REGULARS:

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

GUEST CAST:

Tom Gallop (Lawrence De Vries)
Chris Bruno (Dominic Fryman)
Jay Ellis (Naval Flight Officer Randall Baker)
Omar Elba (Zaki Faheem)
Owen Teague (Alex Fryman)
Steven W. Bailey (Cam)
Mark Espinoza (Detective Lopez)
Lily Mariye (Ashley Hong)
Travis Aaron Wade (Navy Chief Petty Officer Crawford)
Steve Tom (Roger/Morgan)
Rance Howard (Eugene)
Jade Carter (Navy Lieutenant Joshua Gordon)
Bree Condon (Alessandra)
Kent Shocknek (News Reporter)

WRITTEN BY: Joe Sachs

DIRECTED BY: Eric Laneuville

RATING: To Be Announced