A deadly crash slowed down southbound Highway 99 near Highway 12 in Lodi early Thursday morning.
The right lane of Highway 99 is closed and drivers are advised to use I-5 as an alternate route.
The two cars, a Honda Accord and a Dodge Avenger crashed into each other around 6 a.m., leaving the woman in the Honda dead. The man in the Dodge is uninjured.
After the Honda was hit, it went down an embankment and hit a tree. CHP says the impact from crashing into the tree was far greater for the woman than the car crash itself.