China is investigating Jiang Jiemin, who until March served as chairman of the state-owned China National Petroleum Company, or CNPC.
After leading CNPC for seven years, Jiang, 58, became head of the government’s Assets Supervision and Administration Commission.
China’s state-controlled Xinhua news agency reported Sunday that Jiang is suspected of a “serious violation of discipline,” usually a reference to graft allegations.
Last week, three senior executives of PetroChina Company Limited, a subsidiary of CNPC, were placed under investigation.
PetroChina is the biggest oil and gas producer and distributor in China.
Another official from CNPC, Wang Yongchun, was reported last week to be under investigation.
Jiang was first targeted following “a secret Party investigation into a bizarre accident which killed the son of Ling Jihua, a top aide of former president and Party leader Hu Jintao,” the South China Morning Post said.
After the March 2012 accident, Jiang reportedly made large payments from CNPC to the families of two women badly injured in the crash.
The driver “lost control of the black Ferrari on Beijing’s North Fourth Ring Road in the early hours of March 18 and slammed into a wall. He was found dead at the scene, half-naked. Two young women who were with him in the car were both seriously injured,” the report said.