International Atomic Energy Agency Director General Yukiya Amano died Monday. He was 72.
Last week, the IAEA announced Amano would be stepping down because of an unspecified illness.
The veteran Japanese diplomat held the position of IAEA director since 2009, taking over from Mohamed ElBaradei and steering the UN agency through a period of intense diplomacy over Iran's nuclear program.
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He had been preparing to leave his position in March, well before the end of his third four-year term, which ran until Nov. 30, 2021.
The IAEA announced last September that Amano had undergone an unspecified medical procedure. The specific nature of his illness has remained a taboo subject within the agency, diplomats said, but with each public appearance, he had appeared increasingly frail.
"The Secretariat of the International Atomic Energy Agency regrets to inform with the deepest sadness of the passing away of Director General Yukiya Amano," an IAEA statement said.
The agency did detail a timeframe for naming his successor, though a race to succeed him had been taking shape since last week when it became clear he would step down early.
Argentina's ambassador to the IAEA, Rafael Grossi, is running to succeed Amano, and diplomats say the agency's chief coordinator Cornel Feruta of Romania, effectively Amano's chief of staff, is likely to run. Others could also enter the fray.
