Sirung Kosuk, 46, was shot by a lone man on a motorcycle at 4pm yesterday. The bullet hit her in the eye. She died three hours later in the OrBorJor hospital.
Her nephew, Suntiparb Kosuk, 29, was arrested about an hour before she died. He has been charged with murder.
He told police that Ms Sirung had been involved in a dispute with his side of the family.