The California Highway Patrol said the wreck happened shortly before 6 a.m. on the westbound side of the freeway at the Barranca Street off-ramp.
Apparently, the car slammed into construction barrels in the area, and the car's passenger was killed.
There was no word on the condition of driver.
The off-ramp to Barranca Street was closed while the investigation and clean up continued until about noon.
SIGALERT UPDATE IN WEST COVINA: WB I-10 OFFRAMP TO BARRANCA ST. WILL BE CLOSED UNTIL APPROX. 1200 HOURS FOR REPAIRS— CHP Southern Div. (@CHPsouthern) July 10, 2016