Sutherland was unbeaten in his first four pro fights and was to have appeared with Maloney at a news conference Tuesday to talk about his next bout on Oct. 16.

The Metropolitan Police said Sutherland was pronounced dead in the mid-afternoon. Police said his death is not being treated as suspicious, a suggestion that no one else was involved.

Maloney, who once managed former heavyweight champion Lennox Lewis, was taken to a hospital. Tests revealed the 55-year-old manager had a heart attack, but it was not clear if the attack happened before Monday's events.