Why was the NCIS team reassigned after Jenny death?

It's a bit unclear what you're referring to. There's no instance in the *NCIS* TV series where the entire team was reassigned after the death of a character named "Jenny."

There are a few possibilities, so let's consider some scenarios:

* You might be thinking of a different character: Perhaps you're thinking of Agent Ziva David, who was written out of the show after Cote de Pablo's departure. Her departure didn't lead to a full team reassignment, though it certainly had a major impact on the team dynamics.

* A specific episode or season: Maybe you're thinking of a specific episode or season of *NCIS* where a character's death prompted changes within the team. If you can provide more context (like the season or episode number), I might be able to help.

* A different *NCIS* spin-off: Perhaps you're thinking of a different *NCIS* show, like *NCIS: Los Angeles* or *NCIS: New Orleans*. Some of these shows have had significant events involving characters' deaths, and those could have led to team changes.

To help me pinpoint the specific event you're referring to, please provide more details about the situation.