Earlier this week the President of Iran Ebrahim Raisi died in a helicopter crash in bad weather. Raisi was a phenomenally important figure in Middle Eastern politics — not just Iran's President, but the likely next Supreme Leader of Iran. He got there through acts of extreme brutality, showing his willingness to do anything to defend the Iranian status quo. How did Ebrahim Raisi become the heir-apparent to the Iranian Supreme Leadership, and what could happen now he's gone?