Georgia O'Connor -- an undefeated British boxer -- has died at the age of 25 ... months after revealing her cancer diagnosis and just three weeks after getting married.
O'Connor's promoter -- Boxxer -- announced her passing in a statement on Thursday ... calling her a "True warrior inside and outside the ring."
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"The boxing community has lost a talented, courageous and determined young woman far too soon."
On May 9, she told the world she was married to "the love of my life.