Provincial Police Region 8 Lt Gen Sorasak Yenprem said Ronakorn Supamongkhonlert, a native of Ratchaburi province, stabbed Tasanee Chaisri to death with a fruit knife and made off with her gold necklace valued at more than B27,000.
The victim, the wife of a fishing trawler operator, was in the toilet for the disabled.
She was also wearing a gold bracelet also valued at more than B27,000, but he fled without stealing it when someone else came to the restroom in response to her cries for help, he said.
The suspect visited Chumphon to see his mother, and went to the store to rob anyone who appeared to have valuables he could steal and use to clear his gambling debts, Gen Sorasak said.
He said the suspect had previously served two years in jail for a murder committed when he was 16 years old.
Media reports said Ronakorn had shot dead a student friend.
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