In Greek mythology, Zeus is immortal and cannot be killed. While his reign is sometimes challenged, as seen in Hera's unsuccessful rebellion, no myth depicts Zeus's death. Several sources confirm this:
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Multiple Quora and Reddit threads on Greek mythology explicitly state that Zeus does not die in any known myths. https://www.quora.com/Who-killed-Zeus, https://www.reddit.com/r/GreekMythology/comments/9wrs6i/in_greek_mythology_did_zeus_ever_die/
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Wikipedia's entry on Zeus establishes him as the immortal king of the gods. https://en.wikipedia.org/wiki/Zeus
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Homework.Study.com reinforces the idea that Zeus's mortality is not part of the established myths. https://homework.study.com/explanation/who-killed-zeus-in-greek-mythology.html
While some interpretations discuss Zeus being "overthrown" or his "reign coming to an end," these are not equivalent to death. These scenarios refer to a loss of power or the end of an era, not his physical demise. The concept of a god's power fading if forgotten is mentioned, but this is distinct from being killed by another being.
One source mentions Dr. Doom killing Zeus, but this is explicitly framed within a speculative context, likely referencing a work of fiction outside established Greek Mythology. https://x.com/ScyanYT/status/1825538005320208750
The notion of Zeus's death is often explored in creative reinterpretations, but within the established framework of Greek mythology, no one kills Zeus.