The bodies of a wealthy British retiree and his Thai wife were found buried on their own property on Tuesday (Sept 25), a week after an alleged contract killing that implicated the woman's brother, police said.
They've confessed to killing 64 year old Alan Hogg and his 61 year old Thai wife Nod Suddaen.
"The three men conspired in the murder of the couple and our investigation is ongoing to determine exactly who did what", deputy police spokesman Colonel Kissana Phatanacharoen told Reuters.
Police said Satchakit admitted making the order over a family dispute after initially denying he was involved.
'They said that the victims were then buried in the garden'.
Major General Sanpat Praputsra, of Phrae police, said Mr Hogg's brother-in-law had been arrested on suspicion of masterminding the double murder, adding: 'Three suspects were traced from forensic checks on the [stolen] vehicle.
Detectives made a breakthrough in the case on Sunday when a man contacted police to report that he had recently purchased a pick-up truck matching the description of that stolen from the Hoggs' property.
Image The suspects were accompanied by police and the media
He built the sprawling three-story home in the remote region and it features an outdoor pool with changing rooms, snooker table, and summer house.
Police were questioning the three people, hoping to find out what became of Mr Hogg and his wife. Bloodstains were found in the sink and changing area around the pool, with signs that surfaces had been wiped. A mobile phone that was still being charged was also found at the scene.
Police said the vehicle was later picked on CCTV being driven in Sukhothai and Lampang provinces two days later.
He added that prime suspect Varut was arrested later on Tuesday and one of the alleged accomplices told the authorities he helped carry out the murder.
The bodies were located by sniffer dogs and dug up shortly before midday local time yesterday.
Mr Hogg, who previously ran a business in Edinburgh, and his wife had been together for 30 years.
The second dig took place after police traced the couple's pickup truck and found a Lao livestock vendor who lives in Thailand had bought it.