Who was Ebrahim Raisi?
Ebrahim Raisi a hard-liner who formerly led the country's judiciary, was viewed as a protege of Khamenei and some analysts had suggested he could replace the 85-year-old leader after Khamenei's death or resignation.
With Raisi's death, the only other person so far suggested has been Mojtaba Khameini, the 55-year-old son to the supreme leader. However, some have raised concerns over the position being taken only for the third time since 1979 to a family member, particularly after the Islamic Revolution overthrew the hereditary Pahlavi monarchy of the shah.
Raisi won Iran's 2021 presidential election, a vote that saw the lowest turnout in the Islamic Republic's history. Raisi is sanctioned by the U.S. in part over his involvement in the mass execution of thousands of political prisoners in 1988 at the end of the bloody Iran-Iraq war.
Under Raisi, Iran now enriches uranium at nearly weapons-grade levels and hampers international inspections. Iran has armed Russia in its war on Ukraine, as well as launched a massive drone-and-missile attack on Israel amid its war against Hamas in the Gaza Strip. It also has continued arming proxy groups in the Mideast, like Yemen's Houthi rebels and Lebanon's Hezbollah.
Meanwhile, mass protests in the country have raged for years. The most recent involved the 2022 death of Mahsa Amini, a woman who had been earlier detained over allegedly not wearing a hijab, or headscarf, to the liking of authorities. The monthslong security crackdown that followed the demonstrations killed more than 500 people and saw over 22,000 detained.
In March, a United Nations investigative panel found that Iran was responsible for the "physical violence" that led to Amini's death.
Raisi is the second Iranian president to die in office. In 1981, a bomb blast killed President Mohammad Ali Rajai in the chaotic days after the revolution.
Raisi pictured meeting locals in Jofa, East Azerbaijan hours before the crash (IRINN/AFP via Getty Images)