The five Antioch residents were in one vehicle heading east on James Donlon Boulevard when the driver lost control at Nightingale Drive and crashed into a retaining wall at about 11:25 p.m., according to Antioch police.
The vehicle overturned onto its side, killing a 19-year-old man, police said.
The 18-year-old driver and two 16-year-old girls were hospitalized with various injuries. One of the girls remained in critical condition this morning, police said.
An 18-year-old man who was a passenger was treated for minor injuries at the scene.
