Mike Tyson's scheduled appearance in Belfast on Friday evening is off.
A spokesman for the Waterfront Hall, where the event was scheduled to take place, said that it had been called off "due to unforeseen circumstances".
Those who have paid for £25 tickets for the event involving the boxer will be able to receive refunds directly from the Waterfront Hall or Ticketmaster.
However, those who paid for £200 VIP tickets have been advised to contact event promoters Jimmy Clyne Promotions.
The event, titled as 'An Evening with Mike Tyson', was also set to include an appearance by Barry McGuigan.
Those who had bought VIP tickets were scheduled to meet Tyson personally and also have a post-event meal in the company of the boxing legend.
RELATED INTERNET LINKS:
Waterfront Hall
Jimmy Clyne Promotions
The BBC is not responsible for the content of external internet sites