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The tragedy struck the world of Japanese boxing while two boxers died of injuries suffered in their fights which were on the same exact card.
Shigetoshi Kotari and Hiromasa Urakawa, both 28 years old, have each underwent brain damage that resulted in their premature death.
Kotari collapsed shortly after finishing a match at 12 laps against the junior champion of the Light Eastern Boxing Federation and the Pacific Yamato Hata on August 2.
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Two Japanese boxers died after undergoing brain damage during their fights on the same card. (Andreas Rentz / Bongart / Getty Images)
He underwent emergency brain surgery for a subdural hematoma – a condition where blood accumulates between the brain and the skull – but died on Friday.
Urakawa suffered a defeat in Ko against Yoji Saito, and also had to undergo a brain operation, a craniotomy, to try to save his life.
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“We express our deepest condolences to families, friends and the Japanese boxing community during this incredibly difficult period,” said the World Boxing Organization on Social Networks.
In response, the Japanese boxing commission has announced that all OPBF title fights will now be reduced by 12 laps to 10.
Earlier this year, the Irish boxer John Cooney died a week after being taken in intensive care after his defeat of the Celtic-point line title against Nathan Howells in Belfast.

It was far from the first death of the boxing ring. (istock)
A Nigeria boxer also died after collapsing in the ring during a fight in April.