A two-car hit-and-run crash left one person dead and prompted the closure of the northbound 605 Freeway near Whittier early Monday morning.
An initial investigation indicates that a Toyota Prius with four people inside was rear-ended by a black Chevrolet Camaro near the Slauson Avenue exit just before 2 a.m.
The vehicles burst into dramatic flames, video from the scene showed.
The Camaro's driver fled on foot, according to a California Highway Patrol spokesperson at the scene.
Three of the four occupants in the Prius were able to escape, but a male passenger in the left rear seat did not get out and died at the scene, according to CHP.
The crash prompted a SigAlert for the closure of all northbound lanes.
The freeway lanes started reopening about 6:45 a.m., video showed. CHP announced the cancellation of the SigAlert just after 7 a.m.
Authorities initially said three cars were believed involved in the crash, but that information changed later in the morning.
KTLA's Alberto Mendez contributed to this report.