De Pablo relayed, "We're going to play around with the idea that it could possibly be real love, and see how [he] deals with it." Working independently, he draws ire from the agency when he kills suspects rather than bringing them in for questioning.
Season 6 focuses more on Ziva and Tony, but leaves their relationship undefined.
Gibbs manages to have Ziva and Mc Gee transferred back to the team in the premiere, but Tony is still acting as agent afloat on the USS Seahawk.
He does something to her that is almost unforgivable.
However, the reason he does it is because he truly believes it's going to help her.
The characters were initially scripted as having a "cat and mouse" relationship, Ziva's trust issues, a series of other love interests, and Ziva being taken captive and presumed dead between Seasons 6 and 7.
In the season 13 finale, Ziva is 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.
In the following episode, Ziva accompanies Gibbs onto the Seahawk as part of a murder investigation and notices that Tony has pictures of her in a bikini pinned up in his room.
As the season progresses, Ziva seems to have become involved with someone while in Israel but refuses to discuss it.
I'm telling you, it's not 'I hate you' [kissing sound] anger; it's 'I want to kill you' anger.