Police have confirmed they will not reinvestigate the Akeyuth Anchanbutr murder case unless new evidence emerges.
Section 147 of the Criminal Procedure Code provides a case can be reinvestigated only when there is new evidence.
This means if the case is dismissed, it can be retried if something new comes up, said Pol Maj Gen Amnuay Nimmano of the Bangkok police.
However, this case has not been dismissed. Six defendants have been charged and are being tried in court. Some witnesses have been heard and some of the defendants have confessed.
If there is new evidence implicating others, the police can charge them under the existing case.
Akeyuth was the head of the controversial Charter Investment pyramid scheme, which collapsed in 1983. He fled to England in 1984 to avoid charges and invested the proceeds in a chain of oriental supermarkets.
In 2004, after the 20-year statute of limitations of the charges against him ended, he returned to Thailand and launched a campaign against former prime minister Thaksin Shinawatra and his sister Yingluck when she became prime minister in 2011.
In June 2013, it was reported that he had gone missing with a large amount of money. His driver, Santiparb Pengduang, admitted to strangling him to death on June 12. The motive was alleged to be that Akeyuth had fired Santiparb's girlfriend.
Since the coup, there have been calls for the reinvestigation of his murder as many believe it was politically linked.