According to Pattaya City Police, the two men were found in a room on the fourth floor of the hotel at 12.10am on Wednesday allegedly with 'ketamine, cannabis and drug paraphernalia' on the table.
Staff at the Vogue Hotel in Pattaya 'heard a commotion' on the top floor and went to Room 2412 and found the deceased's man's 'friend in a panic' and allegedly 'in a state of severe intoxication'.
Daily Mail Australia has confirmed the identity of the male relative who died in the company of Muay Thai boxing champion Jayson Peter Tonkin, despite Thai media reports that it was Jayson himself who had passed away.
Muay Thai contacts said it was not clear 'when or if' Jayson would regain consciousness in the hospital ICU.
However, it is believed that police could charge him with consumption or possession of ketamine, a 'schedule 2' drug in Thailand which carries a penalty if convicted of one to 5 years in prison.