Ali Larijani, Iran's top national security official and a key figure in its hard-line government, was killed in an Israeli airstrike at 67. His death removes a pragmatic voice navigating Iran's internal factions and crucial foreign relations. Larijani oversaw the brutal crackdown on nationwide anti-government protests that left thousands dead. He also led nuclear talks with the US and negotiated a $400 billion China deal vital to Iran's isolated economy.

As de facto leader after the supreme leader's death, he managed the government's response to the Feb. 28 US-Israel attack. His passing could tighten hard-line control in Iran's complex power structure.