President Xi Jinping's corruption campaign. has especially targeted China's military, which is currently undergoing a modernisation drive.
Zhang Yang, a former member of the China's powerful Central Military Commission, was being investigated over links to fallen generals Guo Boxiong and Xu Caihou, the official Xinhua news agency said.
The probe verified that Zhang Yang "gravely violated discipline", was "suspected of giving and taking bribes" and the origin of a huge amount of assets was unclear, Xinhua said, citing the commission.
"On the afternoon of November 23, Zhang Yang hanged himself at home," the agency said.
Sources had told Reuters that Zhang, who was director of the military's Political Work Department, had been subject to an investigation, but the government had not announced it.
Serving and retired officers have said graft in the armed forces is so pervasive it could undermine China's ability to wage war.
'Using suicide' to escape
Dozens of officers have been investigated and jailed, including Xu and Guo, both former vice chairmen of the commission, which Xi heads. Guo was jailed for life last year. Xu died of cancer in 2015 before he could face trial.
A commentary carried on both the Defence Ministry and military's official websites said the CMC decided on August 28 to investigate Zhang, who had "lost his moral bottom line" and used suicide as a means to "escape punishment from the party and country," an "extremely abominable action."
"This former general of high position and great power used this shameful way to end his own life," the commentary said.
"He would exhort loyalty but be corrupt behind others' backs, a typical 'two-faced person'," it said.