10/28/2015 15:47 EDT | Updated 10/28/2016 01:12 EDT

Forensic psychiatrist hired to determine mental state testifies at Turcotte trial

SAINT-JEROME, Que. — A psychiatrist has taken the witness stand to offer her assessment of the mental state of Guy Turcotte the night he killed his two children in February 2009.

Dominique Bourget is testifying today on behalf of the defence and her expert analysis is expected to be central to Turcotte's claim he was not criminally responsible for the killings.

Turcotte, 43, has pleaded not guilty to two counts of first-degree murder in the slayings of the two children.

He has admitted to causing their deaths but his lawyers are arguing he should be found not criminally responsible by way of mental disorder.

Bourget is a forensic psychiatrist with a specialty in domestic homicides.

She met with Turcotte twice in 2010 while he was detained.

The Canadian Press