how did superman die in the movie batman versus superman
Batman v Superman: Dawn of Justice Luthor executes his backup plan, unleashing Doomsday, a genetically engineered monster with DNA from both Zod's body and his own blood.[N 3] Diana Prince arrives unexpectedly; revealing her metahuman nature, she joins forces with Batman and Superman to eliminate the creature. When they are all outmatched, Superman realizes its vulnerability to kryptonite, and retrieves the spear to kill it. In the creature's last moments, it kills Superman, himself weakened by exposure to kryptonite.
The Dark Knight Rises In the aftermath, Batman is presumed dead and is honored as a hero. With Wayne presumed dead as well, Wayne Manor becomes an orphanage, and his remaining estate is left to Alfred. While visiting Florence, Alfred discovers that Wayne is alive, and in a relationship with Kyle. Blake resigns from the police force and, in accordance with Wayne's will, inherits the Batcave.