In all the shootings, the suspect was described as a lone gunman firing a shotgun from a gold or tan-colored sport-utility vehicle.
Over the next few days, random shootings were reported throughout the area.
A couple driving in West Hollywood were followed Aug. 22 by a tan or gold SUV, which pulled alongside them and opened fire.
The couple were not struck, but a sheriff's official said their Toyota sustained damage from three shotgun blasts.
Then on Aug. 24 three people were shot to death within an hour of each other.
Franco was fatally shot while driving to morning Mass with her family.