Forest officials were informed at 2.20pm that Manoo Wongkhanmueang had fainted and arrived at the scene almost immediately with a doctor.
Manoo had started his hike at about 10.30am.
The doctor and officials tried to revive Manoo, and even tried to stimulate his heart with a defibrillator, but failed.
The patient was then sent to Phu Kradueng Hospital at about 5.50pm, but was declared dead by 6.15pm when doctors could not revive him.