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1983: Kiko Bejines died of brain injuries after a defeat by Albert Davila for the WBC bantamweight title.
1985: Shawn Thomas died of head injuries suffered in a lightweight fight against Chris Calvin.
Owen died six weeks later, having never regained consciousness.
1962: Benny Paret died of brain injuries after losing to Emile Griffith in a world welterweight title fight.
European title fights were shortened to 12 rounds as a result.
1979: Willie Claasen died after he lost to Wilfred Scypion in New York.
He died after an operation to remove a blood clot from his brain.
1994: British bantamweight Bradley Stone died from a massive blood clot on the brain after losing to Richie Wenton.