British retiree, Thai wife found dead on their own property in Tuesday
Two suspects have been arrested and warrants issued for two other men including Varut Rattanasajjakit, Shot's elder brother and the alleged mastermind accused of paying the killers.
"The motive for the killings was a long-running internal family conflict, feuds, and property," he said.
British media reports described Hogg, 64, as a millionaire from Edinburgh who built a lavish home with a swimming pool in the province not far from the Laos border.
A Thai television station showed footage of an excavator digging up mounds of dirt in a search for the bodies.