If person B or whoever is representing him were able to prove ( which he couldn’t in the real world ) that person A was responsible for his death person B could choose to treat the situation as a criminal matter. If this were to happen both parties and those who they choose to represent them would settle the matter under terms mutually agreed upon.
If I were person B I would except that person A’s intent probably wasn’t to infect me with H1N1 and drop the case but everyone is different and would be free to make up their own mind.