Zhu Tiezhi, the deputy editor-in-chief of Qiushi Journal, died on June 26, the online edition of People's Daily, the official newspaper of the Communist Party, reported without providing the details.
Zhu, 56, was found to have hanged himself in the office's garage, a report on the online edition of Chinese magazine Caixin said.
Zhu suffered from depression and was concerned over ideological debates in recent years pitting reformists against a group of increasingly vocal academics in the conservative camp, hisd friend said.
The report said they increasingly question reform and opening policies in place since late 1970s under late leader Deng Xiaoping being followed in the last three decades by Chinese leaders including President Xi, who is the General Secretary of the party.
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Zhu, a famed essayist on party theories, warned in Qiushi and other publications on multiple occasions that taking such debates too far could undermine reform that is essential to tackling corruption and other pressing issues, according to this friend.
Zhu said several times that the most horrible thing for a scholar is to lose his integrity, his independent way of thinking and unique views, the friend, who was not named, said.
Overseas Chinese media reports speculated that Zhu killed himself partly due to links with Ling Jihua, a fallen former aide to Xi's presidential predecessor Hu Jintao.
Ling faces charges of accepting bribes and illegally obtaining state secrets and expected to be sentenced shortly.