Recently, the President of Iran, Ebrahim Raisi, died after his helicopter crashed into a mountain during thick fog. A few weeks later, the Vice-President of the southern African nation of Malawai also died in a plane crash. Both of these incidents appear to be caused by mechanical malfunctions or pilot errors. However, just as with the John F. Kennedy assassination, the deaths of heads of state in plane crashes frequently spark conspiracy theories and debates about malicious activity. Here are five heads of state who have died in plane crashes since the 1980s.