Rogue trader Nick Leeson for the first time told his old boss "sorry" for single-handedly bringing down Barings Bank, in a face-to-face meeting to be broadcast Sunday.
Peter Norris told Leeson he wanted to punch his "lights out" as the scale of his deeds emerged.
Leeson's risk-taking deals bankrupted Britain's Barings Bank in 1995 after losing $1.3 billion on bond derivatives.
"Remorse is a word that is bandied around an awful lot, but I am sorry and my apology to Peter is genuine," Leeson said on the BBC radio programme "The Reunion".
Leeson was given a jail term of six-and-a-half years in Singapore for illegally concealing trading losses and served four years of his sentence.
He admitted he did not know whether his apology would "make any difference".
Leeson took ever greater risks in an attempt to recoup his losses, which spiralled out of control.
He went on the run, leaving a note on his desk reading "sorry". He was brought back to Singapore to face trial. While in prison he was diagnosed as suffering fr