In chapter 7 the creature kills Victor's brother and william.
Then kills Elizabeth the night of victors and her wedding.
Victor Frankenstein dies aboard Captain Walton's ship.In response, the monster kills Frankenstein's best friend Henry Clerval,
later kills Frankenstein's bride Elizabeth Lavenza on their wedding night, whereupon Frankenstein's father dies of grief
With nothing left to live for but revenge, Frankenstein dedicates himself to destroying his creation.Upon Frankenstein's death, the creature declares that he will kill himself soon and jumps off the ship.
Both characters exhibit dangerous, self-serving behavior throughout the book, and they both die by the story's end.