The two Thai holiday islands have now been united in the hunt for the killer or killers of Peter Reisz, 47, a Hungarian found battered and stabbed to death this week on Phuket.
An arrest warrant has been issued for Moshe David, 38, a prominent Samui businessman who possibly has dual nationality as well as investments in property and tourism in Thailand.
According to Colonel Kaithong Janthongbai, who is overseeing the Phuket aspects of the investigation, the widening probe could involve ''many, many disappearances.''
The wife of wanted man Moshe David, who possibly has Hungarian and israeli passports under different names, has given police ''useful information,'' according to a Bangkok Post report.
Duangjit Chuanjit, 40, who lives on Samui with her husband, denied any involvement in Mr Reisz's savage and brutal execution-style death.
But she did admit that her husband and Mr Reisz were long-time friends who recently had a conflict in their real estate business.
She said her husband arrived home on Samui in a white Toyota Hilux Vigo belonging to Mr Reisz on November 28, four days after his friend went missing on Phuket.
Mr David advertised the pickup for sale at 500,000 baht, Khun Duangjit said, and left home on November 30. She has not been able to contact him since.
The pair of business friends were involved with a group of eight to 10 key property deal-makers on Samui but had fallen out over a land investment worth 15 million baht.
Phuket police have established that Mr David had been spotted on Phuket asking questions about the whereabouts of his business partner and buying plastic bags.
Mr Reisz's stabbed and beaten body was found in plastic bags near Patong Hill in central Phuket on November 30.
Police think Mr David is now in hiding somewhere in Thailand and has yet to try to flee the country.