Zhang Yang, 66, a member of the Central Military Commission CMC) - China's highest military body - hanged himself at his home in Beijing on November 23, state-run Xinhua news agency reported quoting CMC as saying.
Since October last year Zhang was under investigation over his links to Guo Boxiong and Xu Caihou, two former Vice Chairmen of the CMC who were expelled from the ruling Communist Party, the report said.
Hong Kong-based South China Morning Post quoted sources as saying that Zhang hanged himself in his home and the news of his death had been conveyed to all People's Liberation Army (PLA) theatre commands.
Zhang was head of the powerful Political Work Department of the CMC when he along with the then chief of general staff General Fang Fenghui reported to have faced investigations since October last when they were not seen in public.
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Both Fang and Zhang faced anti-corruption investigations ahead of last month's once-in-a-five-year Congress of the party.
The "ousting" of Fang and Zhang is further proof that Xi is "cementing his control over the military", the Post reported at the time.
Fang was replaced by Gen Li Zuocheng, a decorated veteran of the Sino-Vietnamese war, and Admiral Miao Hua, formerly the PLA Navys political commissar, has been appointed as head of the Political Work Department.
Over a million Communist Party officials were punished since Xi launched a massive anti-corruption campaign when he took over power in 2015.