“Rest in peace, Shigetoshi Kotari. The boxing world mourns the tragic passing of Japanese fighter Shigetoshi Kotari, who succumbed to injuries sustained during his August 2nd title fight,” they wrote on Friday alongside a black and white photo of Kotari raising one arm in the air.

Shigetoshi Kotari and Hiromasa Urakawa pass away within a day of each other after separate bouts on the same card.

Super featherweight Shigetoshi Kotari and lightweight Hiromasa Urakawa, both 28, fought on the same card at Tokyo's Korakuen Hall on August 2 and died days later following brain surgery.