The 18-year-old whose vehicle struck and killed a bicyclist on Foothill Road last month was doing 83 miles an hour, more than twice the legal limit, court documents show.
The speed limit on Foothill Road at the location of the crash is 40 miles an hour.
Cody Matthew Hall was also passing another vehicle in a two-way, left-turn lane and across double yellow lines, those documents say.
When Hall, who police said was driving a 2004 silver Dodge Neon, attempted to pull back into his lane, he lost control.
"Hall's vehicle continued northbound out of control, subsequently colliding with two bicyclists traveling northbound in the east bike lane of Foothill Road," according to a probable cause declaration filed with the court. "As a result of the collision with the two bicyclists, one bicyclist was severely injured and the other bicyclist was fatally injured."
The young driver, who graduated from Foothill High in June, was charged Friday with vehicular manslaughter with gross negligence and reckless driving with serious injury. He was released on $100,000 bail.
Diana Hersevoort, 58, of Dublin was killed in the June 9 crash near Golden Eagle Way that occurred around 1 p.m. A police report from the crash said Hersevoort was thrown from her bicycle and pronounced dead at the scene.
Her husband Joe was taken to a hospital where he was treated for injuries and released with a broken leg.
The bicycle ride was a weekly tradition of the couple, who rode together in various parts of the Tri-Valley region, their daughter, Heather Grimm, said in an earlier interview. They had been together for 35 years.
Hall stopped at the scene and initially was cooperative with police, answering questions. He did not give a statement when asked.
The teen's father was arrested after police served a search warrant looking for evidence in their investigation into the crash.
Aaron Hall pleaded not guilty to felony weapons charges after police said they discovered two illegal assault rifles and "thousands of rounds of ammunition" in a gun safe at the Halls' home in the 4200 block of Echo Court.
The elder Hall was charged with possession of a firearm by a convicted felon, possession of an assault weapon, possession of ammunition by a felon, and possession of a non-narcotic controlled substance. Police said they found four Daytrana patches, a stimulant used to treat ADHD that Aaron Hall had without a prescription.
Aaron Hall turned himself in July 13. He was released the same day after posting a bond of $265,000.
Court records show he had two felony convictions from 1994 for assault with a deadly weapon and firing at an inhabited dwelling. A pretrial hearing on the new charges has been set for Aug. 28.