Lt. Jane Doe - S2-E4
Plot hole: It really doesn't make sense that they found the real killer from Jane Doe #1 assuming he also killed Jane Doe #2. They only found him because they assumed he was in prison for the last 10 years. One could explain that he must have gone to prison shortly after the first murder because he said he'd be back but wasn't, but that he was actually recently released is just pure coincidence. And without finding him they would never have suspected Officer Cluxton.
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