John George Perryman

John George Perryman, 24, died of injuries sustained while sparring with James Dousey at London, England, 19 March 1898.

After watching some club fights, the two men decided to spar three rounds with gloves. After the third round, Perryman said "he felt queer," so they stopped. Perryman went to the doctor the next day. Soon after, he went into a coma and died. Cause of death was attributed to bleeding on the brain, the result of a blow to the head. The jury ruled accidental death.

Source: Death under the Spotlight: The Manuel Velasquez Boxing Fatality Collection: [1]