A forensic psychiatrist who interviewed alleged murderer Richard Henry Bain has told his first-degree murder trial she believes he was likely suffering a psychotic episode the night of the shooting.

Marie-Frederique Allard says there is a high probability Bain suffered from a bipolar disorder.

Bain, 65, has pleaded not guilty to the murder charge, three counts of attempted murder and two arson-related charges in connection with a shooting on Sept. 4, 2012, the night the Parti Quebecois won the provincial election.

The Crown has argued the crime was premeditated and politically motivated, while the defence has countered Bain should be held not criminally responsible by way of mental disorder.

Allard told the jury today that Bain was also showing signs of overdosing on medication in a police interrogation video taken hours after the shooting.

She adds that Bain allegedly committed the crime because he believed he had been chosen by God to carry out a mission.