SAINT-JEROME, Que. -- Twelve jurors were chosen on Tuesday at a new trial for a former Quebec cardiologist who is charged with first-degree murder in the deaths of his two children.

Seven men and five women will decide Guy Turcotte's fate at a trial that is expected to last three months and feature about 30 witnesses called by the Crown.

Turcotte, 43, pleaded not guilty on Tuesday to the murder charges in the 2009 deaths of Olivier, 5, and Anne-Sophie, 3.

Quebec Superior Court Justice Andre Vincent is expected to address the jury on Wednesday.

The story riveted Quebecers for weeks in 2011 as a lengthy trial heard how the popular doctor in a town north of Montreal came to be charged

Quebec's top court ruled in 2013 that Turcotte should stand trial again after concluding the trial judge had erred in his directives to the jury.

The Supreme Court of Canada refused to hear Turcotte's attempt to have the new case dismissed.

The five women on the new jury include a waitress, a fashion adviser, an esthetician, a butcher and a secretary.

Three of the men are retired, with one having been a teacher, another a printing supervisor and the third a businessman in cabinetmaking.

There is also a real-estate broker, an engineer, a box-store employee and an out-of-work merchant.