Trainer Liam Wilkins has had his license revoked by the British Boxing Board of Control (BBBofC) after a sparring session left ex-boxer Nick Blackwell fighting for his life in hospital.
Wilkins oversaw a sparring session between Blackwell and Hasan Karkardi in November.
Blackwell retired from boxing last April after waking from an induced coma having suffered "a bleed on the brain" following a fight against Chris Eubank Jr.
Blackwell suffered complications after sparring and regained consciousness from a second coma in December.
A BBBofC statement said Wilkins' conduct was "detrimental to the interests of boxing" and that "it is not in the interests or welfare of boxing for him to hold a trainers licence."
Karkardi's actions were deemed "not in the interests of boxing" and he has consequently received a six-month suspension.