asked how Gibbs would know that the boy's mother was deceased. DiNozzo replied, "Special Agent Todd is dead." In "Hiatus, Part II" (S03E24) When Gibbs loses his memory Ziva reminds Gibbs of Todd's murder and of Ziva killing Ari before taking Gibbs' hand and using it to slap herself on the back of the head. During season four, Gibbs accidentally called Ziva "Kate" after returning to NCIS following his temporary retirement. Todd is also mentioned briefly by Dr. Mallard in "Aliyah" (S06E25). During "Truth or Consequences" (S07E01), Tony states that the third member of team Gibbs is deceased, and for the past four years that position has been filled by Ziva David. In "Patriot Down" (S07E23) Following the murder of SSA Lara Macy, Tony inquires as to who killed "another female NCIS agent", referencing Kate's passing. Kate's sister, Dr Rachel Cranston, was introduced during "A Man Walks Into a Bar..." (S08E14), in which she was conducting mandatory psychological evaluation of the MCRT. Flashbacks of archive footage, alternate takes and deleted scenes including one from the Season 2 episode, "An Eye for an Eye", are used for illustrating the memories of Gibbs, DiNozzo, Sciuto, Dr. Mallard, McGee and Rachel as they remember their deceased friend and sister. A scene where Rachel sleeps behind Todd's former desk mirrors a similar scene with Todd in "Twilight". At the episode's conclusion, Rachel tearfully mentions that the team have been "better than [Rachel] at letting go", revealing her need for closure. Gibbs then takes her to his basement, showing Rachel where Ziva killed Ari, helping her to find closure. Sasha Alexander recorded voice clips for this episode. Later, in "Nature of the Beast" (S09E01) several references to Kate are made, whilst Rachel Cranston is referred to as "Doctor Kate's sister". During "Life Before His Eyes" (S09E14), an alternate-universe version of Kate is shown in which she was never killed by Ari, is still an NCIS agent, and is married to DiNozzo with a baby girl named Kelly. Her desk is adorned with photographs of her and her husband, whilst her survival means Ziva is still a foreign national. In "Psych Out" (S09E16), Kate is mentioned when her sister returns to NCIS, and in "You Better Watch Out" (S10E10), it is revealed Tony named his goldfish after Kate. The goldfish is featured prominently until season thirteen's "Family First", and plays a significant role in "Whiskey Tango