SAINT-JEROME, Que. -- The Crown in Guy Turcotte's double murder trial has completed his final arguments and suggests the slayings of his two young children were acts of revenge against his now ex-wife.

Prosecutor Rene Verret took less than one full day to go over his case, saying the former Quebec doctor consumed windshield washer fluid after stabbing his children to death, contradicting a key defence argument.

The 11 jurors will now return Monday for final instructions from Quebec Superior Court Justice Andre Vincent before being sequestered to determine Turcotte's fate.

Turcotte, 43, faces two counts of first-degree murder in the February 2009 slayings of Olivier, 5, and Anne-Sophie, 3.

Verret's closing arguments today followed defence attorney Pierre Poupart's final arguments, which spanned five days and wrapped up Tuesday.

Verret suggested the motive in the killings was vengeance against his ex-wife for the end of their marriage.

The defence has argued Turcotte should be found not guilty by way of mental disorder.

Poupart said a suicidal Turcotte began drinking washer fluid to kill himself and then decided to take his children with him when he felt he was dying.

Verret suggested to the jury that given the levels of methanol in Turcotte's blood a day after the slayings, he'd actually consumed the fluid just before his arrest.