A Sheffield-trained boxer died following a triumphant win in Doncaster on Saturday.
Scott Westgarth, 31, won on points over 10 rounds against Dec Spelman, 26, in the English title eliminator.
Westgarth appeared in post-fight interviews before he collapsed in the dressing room and was taken to Sheffield’s Royal Hallamshire Hospital.
Mr Westgarth, originally from Newcastle, was knocked down on the ropes just before the bell of round 10.
God bless @scottwestgarth 2 promote a Boxing show and a young man doing a job he loves losing his life I have no words RIP lad thoughts go out 2 yr family and yr team it’s been the hardest few days I’ve had to endure no idea what 2 do moving forward 💔😔
— Stefy Bull (@StefyBull) February 26, 2018
Westgarth was considered an underdog for Saturday’s fight, and had a record of six wins, two losses, and a draw.
Saturday’s victory left Westgarth just one win away from becoming the English light heavyweight champion.
A former ski instructor who previously worked as a chef at the Royal Victoria Holiday Inn in Sheffield, Westgarth took up boxing at the age of 24.
The night’s other bouts were cancelled after Westgarth was injured.
Curtis Woodhouse, who was due to face Wayne Hibbert in the final fight at Doncaster’s The Dome, paid his respects on twitter.
Prayers are with Scott Westgarth this evening, sometimes with all the hype around boxing you forget how dangerous this sport is. My fight with @JWHIBBERT is irrelevant and means nothing compared to life. Fingers crossed Scott is ok
— Curtis Woodhouse (@curtiswoodhous8) February 24, 2018
Many have taken to social media to pay tribute to Scott Westgarth, including his opponent on Saturday, Dec Spelman.
Absolutely heartbroken and lost for words ail continue to pray for Scott’s family and the people close to him rest easy my friend 🙏 xxx
— dec spelman (@dec_spelman) February 26, 2018