How does Frankenstein die?

Victor dies from pneumonia, which he contracts as he travels across the icy wastes of the Arctic to escape his hideous creation. In a sense, then, one could say that the Monster has inadvertently caused Frankenstein's death. But ultimate responsibility for Frankenstein's fate lies with the man himself. Had Victor not created the Monster, he wouldn't have had to run away from him in the frozen North; if he hadn't had to run away from him in the frozen North, it's unlikely he would've contracted pneumonia.

The manner of Victor's death is somewhat ironic. Here is a man who thought he could harness the forces of nature to create a race of superhumans who would take over the world and bow down before him as a god. Yet nature has now had her revenge, not just in the shape of the Monster itself, but in the bitingly cold climate of the frozen Arctic, which is the immediate cause of Frankenstein's death.

At the end of the novel, as recorded by Walton, Victor Frankenstein is so sick and worn down from pursuing his creature across the Arctic that the ship's surgeon says he will die in a few hours. Victor then tells Walton that he has lost all his anger toward the creature. He also admits he failed his creation by not caring for him properly. Yet even in this moment, he still tries to justify himself by saying he put the needs of humankind ahead of the needs of the creature, even though he admits the creature was a sentient life form. Because he could think, reason, and feel like a human, and was made of human parts, the creature essentially was human, but Victor treated him as a monster.

As the surgeon predicted, Frankenstein dies of his sickness and exhaustion. Stricken with grief, Walton comes into his room to find him a corpse—and to find the creature standing over the body. The creature takes responsibility for having driven his creator to his death. He tells Walton of his anguish and agony, and he assures Walton that he need not fear that he will be any further menace to humankind. He tells Walton that he going to the farthest northern region of the earth, where he will gather wood, build a huge funeral pyre, and throw himself into the flames. We never know for certain that the creature has killed himself, but it is implied that he is telling the truth about his plans.

How did Elizabeth die in Frankenstein?

Elizabeth, the beloved friend and, later, fiancee of Victor Frankenstein, is murdered by the creature Victor has made. The creature threatens Victor that he will be with him "on [his] wedding night," so Victor fears early on that Elizabeth will not be safe with him and tries to dissuade her from marrying him. However, Elizabeth will not be dissuaded, insisting that she loves him, and of course, he cannot tell her the truth. Unfortunately, in chapter 23, we see the outcome of this.

Elizabeth retires alone into a room just when Victor is beginning to think the threat has passed. He then hears her scream terribly and rushes in to see what has happened. He finds her dead, having been apparently thrown across the bed. Victor is so surprised that he faints. When he wakes, Elizabeth has been rearranged into a sleeping posture, but there is a mark on her neck indicating the grasp of the "fiend"—Victor's creation. Victor then sees the creature grinning at him through the window. He attempts to shoot at it but misses.