Shaka Zulu was not killed by his aunt. In fact, he was assassinated by his half-brothers in 1828. His half-brothers, Dingane and Mhlangana, conspired against him and stabbed him to death. This event occurred due to a power struggle within the Zulu kingdom, and his aunt was not involved in his assassination. Therefore, the statement that Shaka Zulu was killed by his aunt is false.