The investigation into the death of a disciplinary inspection official in Qing'an county, Heilongjiang Province, who was allegedly beaten to death after he went to Beijing to report discipline violations of senior county officials, has failed to move forward, Caijing Magazine reported Tuesday, citing his family members.

Fan Jiadong, 46, was allegedly beaten by a group of masked people on April 2 in Qing'an and suffered multiple fractures. Fan died from complications from his bone injuries on May 1.

His family said Fan had no enemies. But his work required him to deal with many cases involving officials' violations.

Fan began going to Beijing in June 2014 to submit reports to the Central Commission for Disciplinary Inspection of the Communist Party of China. His most recent document was submitted on February 12, according to Caijing.

The document, jointly signed by Fan and two others, accused the county's Party chief Sun Jingshan and county head Li Yingnan for their alleged involvement in the illegal construction of a deluxe office building after the State Council requested all government bodies not to build any new office building for five years.

At least 30 million yuan ($4.8 million) was invested, yet the new building was not being used, the document read.

No suspect has been arrested, Caijing reported.

A staff member at Fan's office confirmed his cause of death, but refused to confirm if he had been to Beijing.

A Qing'an publicity official told the Global Times that he has no knowledge of the case and senior officials could not be reached for comment.