Construction magnate Tony Accurso is scheduled to finally appear before the Charbonneau commission today.
His name came up repeatedly over the past two years and has fought to avoid testifying and he is considered by many to be the key figure in the inquiry into corruption and the province's construction industry.
Over the course of his career, the construction boss took in hundreds of millions of dollars in public works contracts.
He now faces multiple corruption and fraud-related charges, and argued that appearing before the commission would jeopardize his chance at a fair trial.
He also faces tax fraud charges levelled by Revenu Quebec.
Accurso tried to take his case all the way to the Supreme Court of Canada, but early last month the Court refused to hear him, exhausting his last remaining legal option.
He is, however, expected to ask for a publication ban on his testimony.
Accurso recently sold his infamous yacht the Touch, where he entertained numerous union leaders and politicians.
The asking price was just under $5-million US.