Khamenei, 86, had held ultimate control over Iran’s political, military and religious institutions as Iran’s supreme leader since 1989. He had no known successor, per the Associated Press, making his death likely to create a power vacuum.
Article source: https://www.huffingtonpost.co.uk/entry/trump-says-iranian-supreme-leader-ali-khamenei-is-dead_uk_69a3d9fee4b0d383f5035160