
Pol Captain Monchai Thanakojarn and his team were called to Sirichon Pier in Muang Songkhla at 10.30pm.
They were told that local man Thanwa Chamnan, 35, had admonished oil rig worker Yingyong Hemhongsa, 25, for driving recklessly when Yingyong reached the pier in his pickup truck along with co-workers after a drinking party.
Yingyong allegedly responded by firing five rounds from a 9mm pistol, wounding both Thanwa and, inadvertently, another worker identified only as Natthawuth.
Both victims were taken to Songkhla Hospital, where Thanwa died at 1.15am Tuesday. Police collected a CCTV recording of the incident and two eyewitnesses to apply for an arrest warrant for Yingyong.