Nicole Catsouras, 18, lost control of a black Porsche 911 Carrera while attempting to pass another vehicle at more than 100 mph, California Highway Patrol officials said.
The Porsche crossed the center median, traveled across north lanes and the Alton Parkway southbound on-ramp, before colliding into a toll booth building.
Nicole Catsouras was pronounced dead at the scene from head trauma.
Police said she was attempting to pass a gray Honda Civic traveling about 70 mph in the far left lane, when the Porsche clipped the Honda and lost control.
The Honda then veered to the left and hit the center median.