The charge that he murdered Peter Reisz on Phuket with a heavy wooden beam then a knife is complicated by a second investigation into the probable murder of billionaire Laszlo Csepai.
By telephone from Samui today, Police Superintendent Colonel Wittaya Wargdan confirmed to Phuketwan that no charge has been laid in the billionaire's case, but Mr David remains the prime suspect in Mr Csepai's disappearance and death.
The Hungarian billionaire's bones were uncovered in April when Samui police, working with a team of private investigators, exposed a deep grave in the basement of a luxury villa owned by Mr David.
''Many witnesses have yet to be interviewed in Hungary and Thailand,'' Colonel Wittaya said today.
A special investigative team set up by the Royal Thai Police is pursuing the investigation, the colonel said.
Outside the Phuket Provincial Court yesterday, Mr David's lawyer, Abhisit Chaisuwan, said that he would no longer act on Mr David's behalf.
He said he had talked to his client several times, and been given no information.
Mr David had said that his Thai wife should be contacted to arrange transfer of money from overseas.
Despite repeated calls to the supplied telephone number, Khun Abhisit said there had never been any response.
As reported in April, interviews with Mr David's wife have led police to believe he killed both the billionaire and Peter Reisz.
The murder of Mr Reisz allegedly took place at a Phuket City housing estate on November 24 before the body was dumped at an isolated spot not far away, near Patong Hill.
Mr David was remanded yesterday to appear in court again on December 8.