Here are some key dates:
November 2011: Then-premier Jean Charest creates the commission after months of public pressure.
May 2012: Charbonneau makes her opening statement.
June 2012: First batch of witnesses testify, including Quebec's former so-called anti-corruption czar, Jacques Duchesneau.
September 2012: Longtime FBI agent Joseph Pistone testifies about the Mafia's long-standing involvement in the construction industry. He infiltrated the Mafia under the name "Donnie Brasco."
October 2012: Former construction boss Lino Zambito delivers bombshell testimony about a Mafia tax on projects, a cut for the municipal party and corrupt city officials who were accepting kickbacks.
November 2012: Gerald Tremblay quits as Montreal mayor after testimony that he turned a blind eye to illegal fundraising.
March 2013: The government extends the commission's mandate until April 19, 2015.
April 2013: Tremblay is called and gives his version of events.
January 2014: Testimony produces a wiretap where union bosses alleged they had a deal with the husband of then-Parti Quebecois leader Pauline Marois to get her to oppose the creation of any such public inquiry.
January 2014: Charbonneau releases interim report.
May 2014: Former Liberal transport minister Julie Boulet becomes the highest-ranking current politician to testify.
June 2014: Ex-deputy premier Nathalie Normandeau testifies.
September 2014: Antonio Accurso, a high-profile Quebec businessman, former construction magnate and central inquiry figure, appears at the commission.
September 2014: Testimony portion wraps up with last witness.
Nov. 14, 2014: Charbonneau gives closing statement.
April 19, 2015: Deadline for final report to be tabled.