
The body of Prayut Rodsuk, 50, an officer in a Ninth Infantry mortar regiment based at Fort Surasi, was discovered at 6.30am lying on a beach recliner at a pier on Nong Bua Reservoir.
He had a gunshot wound to the right temple and a 9mm pistol by his side.
The body was sent to Ratchaburi for an autopsy.
The investigation continues.