His lawyer is arguing his client is not criminally responsible due to a mental disorder.
Bain said he doesn’t remember the events of the night when one man was killed and another injured outside a Montreal nightclub as then-Premier-elect Pauline Marois was inside, celebrating the Parti Québécois (PQ) election victory.
The jury is watching video recordings of his police interrogation.
Bain said he doesn’t remember much of the first attempt at questioning, where he seemed confused and complains of a headache.
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Much of Bain’s testimony centred on the use of an anti-depressant he suggested fuelled his actions — and the fact he took as many as nine pills the day of the shooting.
WATCH BELOW: Richard Henry Bain on trial
He can be seen with his head down, mumbling incoherently or ignoring a detective’s questions until ambulance technicians arrive to check on him.
Bain denied allegations the PQ victory that evening and his inability to vote earlier in the day due to a number of bureaucratic snafus played any part in what happened.