<P> Tony DiNozzo and Ziva David are fictional characters from the American police procedural drama NCIS . Tony, an original character, is portrayed by Michael Weatherly, and Ziva, who first appeared in the third season, is portrayed by Cote de Pablo . Frequently referred to by the portmanteau "Tiva" (for Tony and Ziva), the characters' flirtation and the idea of them eventually beginning a relationship became a subject of interest among viewers, and by 2010, TV Guide reported that "many fans have become obsessed with the romantic tension between Weatherly's character and co-worker Ziva". Focus and media coverage on the pair escalated over the years, particularly after NCIS became the most watched television series in America during its tenth season . </P> <P> The characters were initially scripted as having a "cat and mouse" relationship, something that continues into the later seasons . The pairing develops at a slow pace throughout the series and is dealt a number of obstacles . This includes Tony's "commitment phobias", Ziva's trust issues, a series of other love interests, and Ziva being taken captive and presumed dead between Seasons 6 and 7 . </P> <P> In the season 13 finale, Ziva is seemingly killed by a mortar attack arranged by former CIA Agent Trent Kort, and Tony learns that he and Ziva have a daughter, who she named after her sister, Tali . These events drive Tony to leave NCIS to care for their daughter . </P>

When does tony fall in love with ziva
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