Promoter Frank Maloney had to be taken out of Liverpool's Echo Arena on a stretcher by paramedics after watching his heavyweight David Price lose to Tony Thompson.
Maloney, who had a heart attack in 2009 following the death of his fighter Darren Sutherland, was conscious when he left the building but needed treatment by paramedics and was given oxygen.
The 60-year-old former manager of Lennox Lewis had watched the previously unbeaten Price lose in the second round to Thompson, the fight having been stopped by the referee after the British man had been floored.
Maloney then attended the post-fight press conference and backed Price to bounce back from the surprise setback, before falling ill at the venue.
