Guy Turcotte’s second trial for the murder of his two children will begin Sept. 14, 2015 and should last about three months.

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Olivier, 5, and Anne-Sophie, 3, were stabbed to death in 2009. (CBC)

Last November, the Quebec Court of Appeal overturned the 2011 verdict that found Turcotte not criminally responsible because of a mental disorder for the 2009 deaths of Olivier, 5, and Anne-Sophie, 3.

Turcotte spent 18 months at Montreal's psychiatric hospital the Pinel Institute. He was released in December 2012.

Turcotte and his legal counsel attempted to block the retrial by going to the Supreme Court. However, Canada’s highest court denied the request in March and returned the case to Quebec.