NCIS Season 3 Episode 20

While NCIS investigates a national security breach in the Pentagon, suspect lieutenant Hill from the US Navy Encryption is found dead. Her apparent suicide was staged, as Ducky, Plamer and Abby find out while his senile mother must be handled. Hill's presumed contact, Venezuelan embassy protocol officer Simon Rocca, enjoys diplomatic immunity. Yet Gibbs is determined to get him before he can fly back, and arrest the murderer.