Season 3 of NCIS opens on a melancholy note, as the Naval Criminal Investigate Service team headed by the iconoclastic Leroy Jethro Gibbs (Mark Harmon) mourns the death of team member Caitlin "Kate" Todd (Shana Alexander) at the hands of ruthless terrorist Ari (Rudolf Martin). Gibbs' response to this tragic loss is encapsulated in the title of the two-part season opener, "Kill Ari", which introduces Cote de Pablo as new NCI member Ziva David, a former Mossad officer who also has a score to settle with Ari. Another new regular is introduced in the episode "Silver War": Lauren Holly as NCIS director Jenny Shepard, who replaces former director Tom Morrow (Alan Dale) when the latter joins the Homeland Security department. Jenny's arrival adds a whole new dimension to the series, inasmuch as she had previously been the partner, and lover, of Leroy Gibbs. The third season also marks the debut appearances of recurring characters Stephanie Mello as Cynthia Summer and Muse Watson as Michael Franks. Throughout the season, the viewer is offered brief flashbacks to the guarded past of NCI team head Gibbs, culminating in the revelation that the first of his three wives was murdered, along with his daughter.