NCIS: Los Angeles S04E20 - Purity
NCIS: Los Angeles (2009)
S04E20 Purity
Episode Overview
After cyanide is discovered in a shared water jug, a lieutenant tragically dies while a Navy pilot is left in critical condition. The NCIS: LA team steps in to determine if this incident is a one-off event or a precursor to a more extensive plan for widespread water contamination.