Mr Tom Gilmartin will appear at the Mahon tribunal for the sixth day of his sensational evidence about his failed attempts to build two huge shopping complexes in Dublin.
The Co Sligo-born businessman yesterday alleged he had received a number of death threats in the late 1990s not to appear in Dublin Castle. The threats came before he agreed to testify at the tribunal in exchange for immunity from prosecution.
The threats came from people with Irish accents and were made by phone to his home in Luton "on three or four occasions".
One of the callers told him to "remember what happened to Veronica Guerin".
He also received a death threat last year, he told the tribunal.
Mr Gilmartin's revelation emerged during questioning by counsel for tribunal, Mr John Gallagher SC.
He repeated his claims that after a meeting with members of the Cabinet in 1989, he was confronted by an unidentified man in Leinster House. This man demanded £5 million be deposited in an Isle-of-Man bank account or Mr Gilmartin's property plans for Dublin would fail, the tribunal was told.
When Mr Gilmartin refused and told this man Fianna Fáil made the "Mafia look like monks"; the man replied that he could "end up in the Liffey for that statement".