Los Angeles County sheriff's deputy Guillermina Saldana said a car flew off the mountain road and down 500 feet into a ravine.
A male passenger managed to get out and get help. The two other people in the car were hoisted out by helicopter. Vigen Sarisyan, 18, of Tujunga, was pronounced dead at the scene.
The two survivors are being treated for serious injuries. So far, there is no word on what led to the crash.
The Associated Press contributed to this report