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.
Lois & Clark: The New Adventures of Superman Superman's first mission interferes with the illegal dealings of Lex Luthor (John Shea), a Metropolis business giant and benefactor. After Luthor's plot was stopped, Superman let Luthor know he is watching him and the two become arch-enemies. However, Clark respects Luthor's life, even surreptitiously using his superpowers to save Lex from bleeding to death. Luthor sees Superman as a worthy opponent; he ultimately discovers his weakness to kryptonite and realizes he has a secret identity, vowing to learn it in hopes of making the hero's life difficult.