But the momentum of pushing her caused the man to fall out the window and skid about 150ft on the asphalt, before his head struck a streetlight, killing him too, according to authorities.
The minivan fled the scene before police arrived to find the two dead bodies.
Spencer said the investigation is one of homicide, and the driver could be charged with murder.
"Senseless is an understatement," he said during a media briefing on Sunday. "You have a woman who was out riding her bicycle and they pull up next to her and strike her, causing her to die. It's an absolute senseless act."