The case took place early on Jan 17. Police said Porames, his friend, his girlfriend and Noppadol Athibai dined together at a pub on Sukhumvit Soi 55. They were business partners.
The actor argued with his girlfriend, prompting Noppadol, 44, to step in. Porames then fought Noppadol before drawing a gun and shooting him in the head.
Noppadol was pronounced dead later at a hospital.
Widely known as P Porames, the 33-year-old actor appealed against the verdict and placed 1 million baht in surety to back his bail request.