A Malaysian court Wednesday ordered the exhumation of the body of an opposition aide who fell to his death from anti-graft offices where he was being questioned, his family's lawyer said.

The coroner's court order will allow a second autopsy of Teoh Beng Hock's remains, assisted by prominent Thai pathologist Porntip Rojanasunan, lawyer Gobind Singh said.

"The court has ordered the exhumation so that a second autopsy can be held on Teoh's body after the family requested it," he told AFP.

Porntip last month told an inquest into Teoh's mysterious death that the 30-year-old aide may have been strangled and beaten before he died.

The flamboyant expert, well known for challenging authorities in her home country, said there was an 80 percent chance that 30-year-old Teoh was murdered and just a 20 percent chance of suicide.

Singh said Porntip would not be conducting the new autopsy but would assist Malaysian medical examiners in the task.

"Porntip cannot carry out the autopsy as she does not fall within the category of doctors accredited under Malaysia's medical act," he said.

"She will assist the local examiners whom the family will choose, and their names will be forwarded to the authorities next Monday."

Teoh's crumpled body was found on July 16 on the roof of an adjacent building after he had undergone questioning on the 14th floor of the Malaysian Anti-Corruption Commission (MACC) until the early hours of the morning.

He was not accused of any crime, but was being questioned as part of a probe into the opposition-held Selangor state government.

The anti-corruption body said that after being discharged, Teoh chose to rest in the building and was seen just before dawn the same day sleeping on a sofa, but was not seen again until his body was discovered that afternoon.