THE NCIS TEAM INVESTIGATES WHEN A NAVY LIEUTENANT IS THE VICTIM OF RADIATION POISONING, ON "NCIS," TUESDAY, FEB. 20, 8:00-9:00 PM, ET/PT

"Dead Man Walking" -- The NCIS team suspects foul play when a Navy Lieutenant is the victim of radiation poisoning, on NCIS, Tuesday, Feb. 20 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Colin Bucksey directed the episode from a script by Nell Scovell.

Gibbs and the team collaborate with the ailing Lieutenant, who is an inspector for the International Atomic Engery Agency (IAEA), as they recreate his routine in an effort to figure out when the contamination took place. Gibbs is convinced that whoever is responsible for poisoning the Lieutenant was trying to ensure that his next scheduled inspection would not happen. But when the dying man insists that only his two closest colleagues knew of the upcoming trip, the team works to find the culprit. Meanwhile, Tony is surprised when he sees a softer side of Ziva.

SERIES REGULARS:

NCIS Special Agent Leroy Jethro Gibbs: Mark Harmon
NCIS Special Agent Anthony DiNozzo: Michael Weatherly
Dr. Donald "Ducky" Mallard: David McCallum
Abby Sciuto: Pauley Perrette
NCIS Special Agent Timothy McGee: Sean Murray
Ziva David, Mossad Liaison: Cote de Pablo
NCIS Director Jenny Shepard: Lauren Holly

RECURRING CAST:

Jimmy Palmer: Brian Dietzen
NCIS Special Agent Michelle Lee: Liza Lapira

GUEST CAST:

Navy Lt. Roy Sanders: Matthew Mardsen
Mark Sadowski: Marc Vann
Dr. Timothy Hass: Scott Klace
Diane Russio: Kate Norby
Holly Stegman: Erin Torpey
Dee Dee Chesney: Diane Delano

RATING: TV-PG-L