They killed Bobby Nash on 9-1-1 because the show's creators wanted to shake things up and raise the stakes for the other characters. According to showrunner Tim Minear, Bobby's death was a creative decision meant to bring a sense of real danger and consequence to the series, which had been somewhat formulaic and safe for a long time. Bobby died after being contaminated by a deadly virus during a lab explosion, and he heroically sacrificed himself by giving the only available antidote to his colleague Chimney. This was intended to honor the selflessness and risks that real first responders face daily. Peter Krause, who played Bobby, also framed the death as a tribute to those who risk their lives in dangerous jobs. The decision was not driven by network cost-cutting but was a narrative choice to make the story feel more urgent and impactful for viewers and characters alike.