A pickup truck slammed into the back of a stalled big rig in a traffic lane on the eastbound 91 Freeway in Cerritos, pinning the truck under the semitrailer and snarling the morning commute.

A motorist fatally injured when his car slammed into a parked tractor-trailer in Perris was identified Tuesday as a 19-year-old resident of the city. Adrian Quiroz was killed shortly before 7 p.m.