There are two different "Bobby" deaths related to 9/11, so it depends on which Bobby is being referred to:
- Bobby McIlvaine was a victim who died in the September 11, 2001 terrorist attacks at the World Trade Center. He was a media relations worker at Merrill Lynch, found near the outer edges of the site after the towers collapsed. His death involved severe injuries including near decapitation and the loss of his right arm. The exact circumstances of what he was doing in his final moments are unknown, which caused a lot of anguish and speculation within his family.
- Bobby Nash is a fictional character from the TV show "9-1-1," who died in Season 8 in 2025. His death was dramatized as occurring during a biolab rescue mission where he was exposed to a deadly virus. He sacrificed himself by giving the only antidote to a colleague and died in a sealed room to prevent further spread. This death is unrelated to the actual 9/11 event but is a character exit from the show.
If the question is about the real 9/11 event, Bobby McIlvaine died after being caught in the collapse and burning debris of the World Trade Center with severe injuries. If referring to the TV show character Bobby Nash, he died from virus exposure following a biolab explosion in a later fictional timeline. Please specify if you want more details on either one.