Dead Man Walking (S04E16)

Gibbs and the team collaborate with an inspector for the International Atomic Energy Agency suffering from radiation poisoning, recreating his routine in an effort to figure out when the contamination took place. Gibbs is convinced that whoever is responsible for the poisoning 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. (CBS TV Network)