noun, noun or participle which takes 'suru', intransitive verb
Refers to an unexpected, abrupt death, often from natural causes like a heart attack. Used as both a noun and a suru-verb (急死する).
彼は心臓発作で急死した。
He died suddenly of a heart attack.
その俳優の急死はファンに衝
The actor's sudden death shocked his fans.