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Purity is the 20th episode of NCIS: Los Angeles Season 4 as well as the 92nd episode of the entire NCIS: Los Angeles series.

Synopsis

OSP investigate when two Naval officers die from from cyanide poisoning after drinking water from the same jug with the team wondering if the incident was isolated or a test for something much more deadlier.

Plot

Callen after having taken some cyanide.

Cast

Series Regulars

Name Portrayed by Role
G. Callen Chris O'Donnell NCIS Special Agent and the leader of the Office of Special Projects field team.
Sam Hanna LL Cool J A former Navy SEAL-turned-NCIS Special Agent with the Office of Special Projects.
Henrietta Lange Linda Hunt Operations Manager with the Office of Special Projects.
Marty Deeks Eric Christian Olsen A Detective with the Los Angeles Police Department and also the LAPD/NCIS liaison.
Kensi Blye Daniela Ruah NCIS Special Agent with the Office of Special Projects.
Eric Beale Barrett Foa Tech Operator with the Office of Special Projects.
Nell Jones Renée Felice Smith Tech Analyst for the Office of Special Projects.

Recurring Cast

Name Portrayed by Role
ZNN Reporter (Paper Soldiers) Kent Schocknek Reporter.

Other Cast

Name Portrayed by Role
Lawrence De Vries Tom Gallop
Dominic Fryman Chris Bruno Alex Fryman's father.
Alex Fryman Owen Teague Dominic Fryman's son.
Randall Baker Jay Ellis Flight Officer in the United States Navy.
Joshua Gordon Jade Carter Lieutenant in the United States Navy.
Crawford Travis Aaron Wade Chief Petty Officer in the United States Navy.
Zaki Faheem Omar Elba
Cam Steven W. Bailey
Lopez Mark Damon Espinoza Detective with the Los Angeles Police Department.
Ashley Hong Lily Mariye
Roger Morgan Steve Tom
Eugene Rance Howard
Alessandra Bree Condon
  v - e - dNCIS: Los Angeles Season 4
Endgame (NCIS: Los Angeles episode)Recruit (episode)The Fifth Man (episode)Dead Body Politic (episode)Out of the Past (episode)Rude Awakenings (episode)Skin Deep (episode)Collateral (episode)The Gold Standard (episode)Free Ride (episode)Drive (episode)Paper Soldiers (episode)The Chosen One (episode)Kill House (episode)History (episode)Lokhay (episode)Wanted (episode)Red Part 1 (episode)Red Part 2 (episode)Purity (episode)Resurrection (episode)Raven and The Swans (episode)Parley (episode)Descent (episode)
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