Petchkeng’s martial arts club at the Rajamangala University of Technology Phra Nakhon said the fighter succumbed to the injury after a bout in Malaysia.
The death of Petchkeng, whose real name was Kittichai Chaengkha, comes just three weeks after Panphet Phadungchai succumbed to injuries suffered in the ring.
Panphet, real name Sarayut Klinming, died from a brain injury at a Bangkok hospital on July 23, nine days after being knocked out by a spinning elbow in a bout against French boxer Anthony TF at Thupatemi stadium in Pathum Thani. His death led to calls for better medical care at ringside during Muay Thai fights.
On its Facebook page, the university's martial arts club said Petchkeng, who was an alumnus of the university's liberal arts faculty, was considered a skilled Muay Thai fighter.
It added that he had led fighters from the Phatthalung club where Petchkeng was a trainer to success during the 47th Thailand National Games in Sisaket between March 5 and 25.
"The fight sports club would like to express our deepest condolences and send moral support to Kittichai's family," the page said.
Meanwhile, Nuttadaj Vachirarattanawong, owner of Petchyindee Academy Muay Thai gym in Bangkok, said on his Facebook page that he and his brother had handed 100,000 baht to Kittichai's family.
He added that he was worried about Kittichai's young son who is only 1 year and 8 months old.