Who was Ismail Haniyeh, the Hamas political leader who was killed in Iran?

A State Department spokesperson at the time said Haniyeh had "reportedly been involved in terrorist attacks against Israeli citizens. Hamas has been responsible for an estimated 17 American lives killed in terrorist attacks." Haniyeh had in the years since then called for Arab states to stop recognizing Israel by terminating agreements to normalize relations, according to a 2023 report on international religious freedom compiled by U.S. officials. He had lived in exile since 2019 in Qatar, an Arab country that has played a key role in the Israel-Hamas negotiations.