NCIS: Los Angeles Season 4 Episode 20
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.
4 - 24DescentMay. 14, 2013- 4 - 23ParleyMay. 07, 2013
- 4 - 22Raven & the SwansApr. 30, 2013
- 4 - 21ResurrectionApr. 23, 2013
- 4 - 20PurityApr. 09, 2013
- 4 - 19Red (2)Mar. 26, 2013
- 4 - 18Red (1)Mar. 19, 2013
- 4 - 17WantedMar. 05, 2013
- 4 - 16LohkayFeb. 26, 2013
- 4 - 15HistoryFeb. 19, 2013
- 4 - 14Kill HouseFeb. 05, 2013
- 4 - 13The Chosen OneJan. 29, 2013
- 4 - 12Paper SoldiersJan. 15, 2013
- 4 - 11DriveJan. 08, 2013
- 4 - 10Free RideDec. 18, 2012
- 4 - 9The Gold StandardDec. 11, 2012
- 4 - 8Collateral DamageNov. 27, 2012
- 4 - 7Skin DeepNov. 20, 2012
- 4 - 6Rude Awakenings (2)Nov. 13, 2012
- 4 - 5Out of the Past (1)Oct. 30, 2012
- 4 - 4Dead Body PoliticOct. 23, 2012
- 4 - 3The Fifth ManOct. 09, 2012
- 4 - 2The RecruitOct. 02, 2012
- 4 - 1EndgameSep. 25, 2012
