A man has died after he was seriously injured during a charity white collar boxing match.
He had taken part in the Ultra White Collar Boxing event at Harvey Hadden Sports Village in Nottingham last Saturday.
Nottinghamshire Police said his condition deteriorated following the incident and he has died.
Detective Inspector Chris Berryman said: “Officers attended Harvey Hadden Sports Village on Saturday March 25 with partners including East Midlands Ambulance Service.
“A man was left seriously injured following a boxing match and transported to Queen’s Medical Centre.
“Since the incident, his condition deteriorated and he has sadly passed away.
“Our thoughts are with all of his family and friends at this difficult time.
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“We are keeping an open mind and working with the coroner to establish what has happened.”
A spokesperson for Ultra White Collar Boxing said: “Everyone at Ultra White Collar Boxing was deeply saddened to hear of the tragic death of one of our participants, who took part in our Nottingham event on Saturday March 25.
“Our thoughts are very much with his family and friends at this difficult time.
“We are in close contact with his family and continue to offer them all the support we can.
“With investigations now under way by the relevant authorities, it would be inappropriate to comment further at this stage.”
Ultra White Collar Boxing is a partner of Cancer Research UK and the boxing organisation’s website says it has raised more than £25,000,000.
According to its website, Ultra White Collar Boxing has been running events for 14 years and has organised hundreds of events.
The website lists a summary of guidelines and says: “To ensure the safety of all of our participants, we make sure that we strictly adhere to our rules and regulations.”
It adds: “We feel our events offer a ‘gold standard’ in safety and this has been verified by doctors, neurosurgeons and many other professional bodies that have reviewed our practices.”