Abnormity died suddenly. To die suddenly, especially to die of illness.
Zhou Deqiu's younger brother followed his brother's instructions and sent the money to Ji Hanxiong. Ji Hanxiong knew that he had died suddenly, and he couldn't help crying. (Xiao Fuxing's "Life as a Distinguished Person") Due to poverty and lack of medical care, coupled with poor daily necessities, Xue Qin finally passed away on New Year's Eve. (Wu Xinlei's Cao Xueqin XIII)
Death: Farewell. Farewell to the world forever. To die politely (especially for people you admire). Usually with a solemn color.
For this reason, the authorities didn't hold a memorial service for him, and this famous calligrapher died with deep injustice. (Zhang Tongwu's Beyond Love) Less than a year later, I got the bad news of his death. (Ke Ling's Salute to the Pioneers —— Preface to Selected Essays of A Ying)
Also called "Passing away".
While the National Congress was being held, there was unfortunate news that Sun Yat-sen, the great forerunner of the democratic revolution, passed away in Beijing on March 12th, 1925. (Chapter 4 of Historical Draft of Beiyang Warlords by Lai Xinxia and others)
Both refer to death. Often used as a predicate, sometimes used as an attribute.