Business tycoon Noppadol Thammawattana on Friday stepped up pressure on the Medical Council to hasten its years-long ethics investigation of Khunying Porntip Rojanasunand and another forensic expert for alleged irregularities in the autopsy of his elder brother.
Mr Noppadol submitted a letter to the council to ask for an update on its inquiry into Khunying Porntip, director-general of the Central Institute of Forensic Science, and Dr Thamrong Jirajariyavej of Ramathibodi Hospital for their roles in the post-mortem of former Bangkok MP Hangthong Thammawattana.
The businessman, acquitted of killing his elder brother, accused the two leading forensic experts of fabricating evidence to support the murder charge against him.
Mr Noppadol said he had petitioned the Medical Council on June 8, 2006 to look into ethics violations by the two forensic doctors. In recent years, he had asked progress updates five or six times, but there had been no progress.
If the probe continues to move at a snail's pace, he said would petition the Office of the Prime Minister to seek justice.
Hangthong was found dead on Sept 6, 1999, with a bullet wound to the head in Mr Noppadol's room in the family's mansion on Phahon Yothin Road. An initial autopsy by police cited suicide as the cause of death.
That finding was disputed by forensic experts led by Khunying Porntip, then deputy director of the CIFS, who believed the billionaire MP had been murdered.
Khunying Porntip sought a second autopsy, the results of which she said supported her murder theory. A Scottish forensic specialist, Adrian Linacre, of Strathclyde University, confirmed the likelihood of murder.
The second post-mortem led to Mr Noppadol being named the prime suspect.
In 2012, the Criminal Court acquitted him of the murder charges. The Appeal Court later upheld the lower court's acquittal, citing insufficient evidence.