S4·E20 Purity
Core
Aired April 9, 2013
Synopsis
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.
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Frequently Asked Questions
When did Season 4 Episode 20 of NCIS: Los Angeles air?
Season 4, Episode 20 ('Purity') originally aired on April 9, 2013.
How long is Season 4 Episode 20 ('Purity')?
The episode follows the standard broadcast runtime for NCIS: Los Angeles.
What happens in NCIS: Los Angeles Season 4 Episode 20?
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....