I'm curious to know, based on the statement "Who was Zeus killed by?", if you're actually asking about a historical or mythological figure. If we're discussing Greek mythology, Zeus was the king of the gods and is not known to have been killed by anyone. He was a powerful deity who ruled over Olympus and the gods, and was considered immortal. So, the question "Who was Zeus killed by?" doesn't really have an answer within the context of Greek mythology. Could you perhaps clarify your question or provide more context?