Zeus, the king of the Olympian gods in Greek mythology, was not killed. He reigned supreme, overthrowing his father Cronus to claim his position. Therefore, the question of who killed him is irrelevant.
The Immortality of Zeus
In Greek mythology, Zeus, along with the other Olympian gods, possessed immortality. This is a fundamental aspect of their nature and power. Unlike mortal humans, they were not subject to death by natural causes or violence. This is explicitly stated in the provided reference: "In Greek mythology, Zeus is not killed at all". His reign ended not through death, but through the natural shifts and changes within the mythological narratives.