 In "Kill Ari", it is revealed that he targeted and killed Kate merely because he wanted to cause Gibbs pain (even using a Bravo 51 nicknamed "Kate").During an imagined discussion with Dr. Donald "Ducky" Mallard in the morgue, Todd, who had been shot dead in the previous episode, explained that she had not been able to kill Ari because she had looked into his eyes and that there had been something kind in them.She also expressed regret at not killing Ari when she had the chance because she did not deserve to die.