Officers earlier this week issued an appeal asking the public to help them find a vehicle involved in the fatal incident.
The man turned himself in shortly thereafter.
A 64-year-old woman was killed in the incident that occurred the night of July 4. She was struck by a car while walking along Henri-Bourassa Boulevard near Balzac Avenue.
The driver then took off, leaving the scene.
A second car also hit the woman. The driver of that vehicle remained at the scene.
Montreal police are still investigating.