76, of Laguna Niguel, who died June 22 when her car jumped the curb at Starr Drive, went through a greenbelt, over a chain-link fence and hit the train tracks below, had no apparent medical condition, officials said Friday.
According to O.C. sheriff's spokesperson Jim Amormino, Marino's cause of death is pending further testing and toxicology reports, which could take a few weeks.
Her Toyota Camry was traveling at high speed. No one else was hurt, officials said.
The crash caused major traffic tie-ups, including the closure of the southbound 5 freeway off-ramp at Avery Parkway. Metrolink trains were also delayed for several hours.