Police took Pol Col Supat, who was arrested in Phetchaburi's Cha-am district on Saturday evening, from the Provincial Police Region 7 in Nakhon Pathom to Tha Mai Ruak police station in Phetchaburi at 2.30am yesterday.
The doctor appeared stressed and did not sleep the whole night, police said.
Pol Lt Gen Jongjate said he would sign Pol Col Supat's dismissal order today and would ask the Royal Thai Police to reject Pol Col Supat's early retirement request.
Pol Lt Gen Jongjate said an officer who is a suspect in a criminal case is not eligible for the early retirement scheme.
The hospital director said he had earlier approved Pol Col Supat's early retirement request, which is pending final approval by the Royal Thai Police headquarters.
If it had been approved, his retirement would have taken effect on Saturday and Pol Col Supat would be promoted to the rank of Pol Maj Gen under the police force's early retirement incentive, Pol Lt Gen Jongjate said.
Pol Col Supat has been accused of killing Thai couple Samart Noomjui and his wife Orasa Kerdsap, who went missing in 2009.
A Myanmar worker has accused the doctor of killing two other workers at his 40-rai orchard in Phetchaburi's Tha Yang district.
Police searched Pol Col Supat's orchard for a fourth consecutive day yesterday.
A backhoe tractor was deployed to dig up spots where corpses were believed to be buried.
Police, however, found nothing and had to call off the search due to heavy rain.
The search will resume today, said Pol Col Pichai Pokpong, chief of Tha Mai Ruak police station which is responsible for the search.
Sawang Noomjui, Samart's father, yesterday asked police to file a murder charge against Pol Col Supat with Tha Mai Ruak police.
Mr Sawang said he asked them to file the charge after police found a male skeleton and clothes which he believed belonged to his son, at Pol Col Supat's orchard.
"Of course, I'm afraid of his influence because he is a senior police officer, but I have to fight for my son," said Mr Sawang, who also accused Pol Col Supat of threatening him after he tried to investigate the death of Samart and Orasa.
About a dozen of Orasa's relatives yesterday gathered at Tha Mai Ruak police station, where Pol Col Supat was detained, to protest against any temporary release.
Tha Mai Ruak police chief Pol Col Pichai insisted police will oppose Pol Col Supat's bail request and will today seek the court's permission to extend his detention. Police have so far pressed three charges against Pol Col Supat: stealing, possessing stolen items, and illegally detaining people.
Police would press an additional charge of murder against him if a forensic examination of one of the three skeletons found at the doctor's orchard confirms that it belongs to any of the missing persons, said Pol Lt Gen Hanpol Nitwibun, commissioner of Provincial Police Region 7.