The inquest into the death of 16-year-old Frank Varey, who drowned in the River Dee in Chester on July 22 last year, was heard at Warrington Coroner's Court on Wednesday May 18.
A post-mortem examination concluded that Frank, from Halton, had died by drowning.
Assistant coroner Jean Harkin recorded a conclusion of accidental death.
A funeral service was held for Frank at Heysham Free Methodist Church on August 5.
In a statement released after his death, his family said: "We are devastated beyond words, Frank was a legend in the boxing world and in life. May our Young King live on forever."
Frank, who had been a member of Sharpstyle ABC boxing gym in Blackpool, had won several National Championship titles and also represented England at the European Junior Championships in 2019.
His death sent shockwaves through the community with tributes pouring in from the boxing world, including from Tyson Fury.