The victim, identified as 32-year-old Michael Anthony Meza of Pomona, was found outside of a white 2010 Dodge sedan on the White Avenue off-ramp on the eastbound side of the freeway. California Highway Patrol officers made the discovery just after midnight.
Officials said the backseat window on the driver's side was shot out. Pomona police say Meza was shot multiple times in the upper torso. Investigators say the Dodge is registered to someone else other than Meza.
Authorities believe Meza was shot on the off-ramp and not on the freeway. They don't know whether Meza was alone in the car at the time of the shooting.
The victim's father, who did not want to be identified, arrived at the scene. He told Eyewitness News he doesn't believe his son had any enemies and doesn't know why anyone would want to kill him.
The White Avenue exit was shut down for the investigation. Drivers were advised to take the Gary Avenue exit as an alternate.
If you have any information about this incident, you're urged to contact the Pomona Police Department at (909) 620-2095.