If Only S4E20
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If Only

S04E20 Purity

2013-04-09

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.

Season 4 Episodes

1
Endgame
2012-09-25
 2
Recruit
2012-10-02
 3
The Fifth Man
2012-10-09
 4
Dead Body Politic
2012-10-23
 5
Out of the Past (1)
2012-10-30
 6
Rude Awakenings (2)
2012-11-13
 7
Skin Deep
2012-11-20
 8
Collateral
2012-11-27
 9
The Gold Standard
2012-12-11
 10
Free Ride
2012-12-18
 11
Drive
2013-01-08
 12
Paper Soldiers
2013-01-15
 13
The Chosen One
2013-01-29
 14
Kill House
2013-02-05
 15
History
2013-02-19
 16
Lohkay
2013-02-26
 17
Wanted
2013-03-05
 18
Red (1)
2013-03-19
 19
Red (2)
2013-03-26
 20
Purity
2013-04-09
 21
Resurrection
2013-04-23
 22
Raven & the Swans
2013-04-30
 23
Parley
2013-05-07
 24
Descent
2013-05-14