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Closing arguments underway in Guy Turcotte murder trial

WATCH ABOVE: Closing arguments began Tuesday at Guy Turcotte’s first-degree murder trial. Global's Kelly Greig reports.

SAINT-JÉRÔME – Closing arguments began Tuesday at Guy Turcotte’s first-degree murder trial.

READ MORE: Psychiatrist maintains Turcotte mentally ill during slayings under Crown’s cross

Turcotte pleaded not guilty to two counts of first-degree murder in the stabbing deaths of his children, 5-year-old Olivier and 3-year-old Anne-Sophie.

WATCH: Guy Turcotte’s murder trial
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The ex-cardiologist admitted to causing their deaths, but his lawyers argued the 43-year-old should be found not criminally responsible by way of mental disorder.

READ MORE: Guy Turcotte’s mother testifies about rambling conversation she had with her son

The accused testified he drank windshield washer fluid on Feb. 20, 2009, in order to kill himself and decided to murder his two young children to spare them the pain of finding his body.