“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.

Both 28-year-old boxers underwent operations for subdural haematoma, or bleeding inside the skull, after being injured in separate bouts on the same card.