The crash happened about 4:45 a.m., while Culbreath was driving her 2013 Chevrolet Camaro at speeds approaching 100 mph, according to the California Highway Patrol.
Culbreath somehow got on the southbound Orange (57) Freeway going north, then transitioned to the westbound 60 going east, where the Camaro crashed head-on into a 1998 Ford Explorer north of Diamond Bar Boulevard, according to the CHP. A 2006 Ford Freestyle then slammed into the Explorer.
Culbreath's 24-year-old sister, Maya, and another passenger, Kristin Young, 21, of Chino, died in the crash, along with four people ejected from the Explorer. They were identified as Huntington Park residents Gregorio Mejia- Martinez, 47, Leticia Ibarra, 42, Jessica Mejia, 20, and Ester Delgado, 80.
Culbreath faces a maximum life prison sentence if convicted of the murder charges.
Culbreath was convicted of driving under the influence on April 13, 2010, when she was 17, according to Department of Motor Vehicles records. She was stopped for two more violations before her license was reinstated in December 2011, according to the DMV, which lifted restrictions on her license just a week prior to the deadly crash.
—City News Service contributed to this report.