SAINT-JEROME, Que. — Closing arguments are set to begin today at Guy Turcotte's first-degree murder trial.
A toxicologist and Crown expert was cross-examined by the defence last week as the presentation of evidence ended.
Turcotte has pleaded not guilty to two counts of first-degree murder in the stabbing deaths of his son, Olivier, 5, and his daughter Anne-Sophie, 3.
The ex-doctor has admitted to causing their deaths, but his lawyers argue the 43-year-old should be found not criminally responsible by way of mental disorder.
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.
The Canadian Press