Kiatwanchai stopped boxing in 1992 but made a comeback in 1996. He only won one fight during this comeback and retired for good in 2000.

After retirement he lives difficult. He no funds collected because of lavish spending and gambling addiction. Now earn his living by singing along nightclub and restaurant. And the problems faced by the virtually invisible, which will blind permanently as a result of the knocked by González in 1992.

He was born in a Thai-Chinese family in Thailand and turned professional in 1987. The next year he fought Hiroki Ioka for the Lineal and WBC strawweight titles. The bout ended in a draw and in the rematch Kiatwanchai won the title by a twelve-round majority decision. He defended the title twice before losing to Jum-Hwan Choi on November 12, 1989. He beat future champion Rolando Pascua before challenging for the WBC title again, on June 8, 1990. He lost to champion Hideyuki Ohashi by a twelve-round unanimous decision. His final try at the title came in 1992, when Humberto González knocked him out in defense of González’s WBC light flyweight title.

Napa Kiatwanchai (born July 27, 1967) is the former Lineal and WBC strawweight champion from Nakorn Rachasima (Korat) province, Thailand.