Iran's Supreme Leader death reshapes geopolitical landscape. Ayatollah Khamenei's killing in a U.S.-Israeli strike ends 37 years of rule and creates significant uncertainty for Iran's theocratic system. The operation demonstrates strategic deception, with mixed messaging potentially lowering Iran's guard. However, experts warn the leadership change is not guaranteed to destabilize the regime long-term. The Revolutionary Guard may consolidate power, pushing the system toward greater militarization. Key implications include potential shifts in Iran's support for proxy groups like Hezbollah and Hamas, evolving rivalry with Saudi Arabia, and critical impacts on energy security around the Strait of Hormuz. A 40-day mourning period provides time for succession management.