 Kate has remained a significant part of the "NCIS" universe in the years following Alexander's final episode ("Kill Ari Part II").In "Mind Games" (S0303), for example, DiNozzo tells Special agent Timothy McGee to ask Todd whether they have knee pads or not before realizing she is dead, while suspect Kyle Boone uses Todd's death in an attempt to intimidate Gibbs.In "Probie" (S03E10), McGee states that unlike Todd, he had no previous law enforcement experience before enlisting as a NCIS Special Agent, while in "Bait" (S03E18) a teenage student held his classmates hostage inside a classroom by threatening them with a bomb strapped to his chest.