A passenger died on Thanksgiving afternoon after the driver of the car allegedly tried to pass slower vehicles but crashed head-on into an oncoming sedan in unincorporated Livermore.

The situation unfolded at about 12:45 p.m. Thursday on Altamont Pass Road, about three quarters of a mile east of the Greenville Road intersection, according to Officer Tyler Hahn of the California Highway Patrol office in Dublin.

The driver of an eastbound Honda Civic going 40 to 50 mph came upon slower-moving traffic and crossed the solid double-yellow lines in an attempt to pass. When the Civic was traveling eastbound in the westbound lane, it collided with an oncoming Toyota Prius driving about 40 to 50 mph in its correct lane, according to Hahn.

The lone passenger riding in the Civic died from injuries sustained in the head-on crash, according to Hahn. The Civic's driver sustained major injuries. Their names were not immediately released.

The driver and 13-year-old passenger in the Prius sustained minor to moderate injuries and were taken to area hospitals for treatment, according to Hahn.

The crash remains under investigation. Hahn said officers do not think alcohol was a factor.

Anyone who may have witnessed the collision is asked to call CHP-Dublin at 925-828-0466, according to Hahn.

Editor's note: This story has been updated to reflect the correct age of the surviving passenger as 13 years old, after the California Highway Patrol updated an error in its original information.