Bobby Nash was killed off in season 8 of the TV show "9-1-1" due to a deliberate creative decision by the show's showrunner Tim Minear. His character contracted a lethal virus during a high-risk biolab rescue mission where he sacrificed himself by giving the only available antidote to his colleague Chimney, choosing to save others rather than himself. This decision to kill Bobby was meant to keep the stakes real in the show, prevent predictability, and open up new opportunities for other characters' growth. The actor Peter Krause, who played Bobby, was professional and understanding about the creative reasoning behind his character's exit. The storyline gave fans a powerful farewell with Bobby's heroic and selfless death and set up a new chapter for the series going forward.