Murder 2.0 - S6-E6
Trivia: When the 3rd victim dies in the interrogation room, McGee is instructed to call Base Medical. When he moves the phone from his ear and says "Tony" you can see the default screen for the iPhone requesting it be plugged in to iTunes for setup.
Answer: I hadn't seen the backdoor pilots yet but while it wasn't explicitly stated, at least onscreen, I heard somewhere Vivian got either fired from NCIS due to jeopardizing a case, got resigned from the agency, or transferred to the FBI.
Raykvega423