NCIS: LOS ANGELES - Season 4 - Episode 20
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"Purity" Pictured: LL COOL J (Special Agent Sam Hanna) and Chris O'Donnell (Special Agent G. Callen). 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. Photo: Cliff Lipson/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.
Get a first look of what might happen in NCIS Los Angeles episode “Purity” by looking through the promotional pictures of CBS…