Bobby Nash, played by Peter Krause, left the TV show "9-1-1" because the character was killed off in season 8 in a heroic act of self-sacrifice. Bobby's breathing apparatus was compromised during a hazardous bio lab incident involving a deadly virus, and he chose to sacrifice himself to save his team, particularly Chimney, by giving up the only available vaccine for the virus. This exit was a creative decision by the show's creator, Tim Minear, who believed that high stakes like this were necessary to keep the show impactful. Peter Krause also spoke about how the character's arc honored the real-life risks first responders take and expressed that while fans have a right to be upset, Bobby was built for this heroic farewell. The decision marked the end of Bobby's impactful eight-season run on the show.