“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, both 28, died after sustaining brain injuries during separate bouts on the same card at Tokyo's Korakuen Hall.

Japanese boxers Shigetoshi Kotari and Hiromasa Urakawa have died from brain injuries suffered during separate fights at an Aug. 2 match in Tokyo.