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A young man from Union City now faces a felony vehicular manslaughter charge for allegedly causing a deadly head-on collision while racing with a third vehicle on Highway 84 near Ruby Hill last summer.
The single count filed against Eduardo Guitierrez Delgadillo in Alameda County Superior Court last week followed nearly one year of investigation by the California Highway Patrol and case review by the Alameda County District Attorney’s Office.
Guitierrez Delgadillo, who is set to turn 21 years old this week, is scheduled to appear in court for the first time in the case next month. He was informed of the charge by mail rather than arrested, and he is not yet represented by an attorney, according to court records.
The high-speed collision occurred during the evening commute July 15, 2025 on Highway 84 in unincorporated Livermore, just west of Ruby Hill Drive in the area of Pigeon Pass.
The CHP reported Guitierrez Delgadillo was driving a Lexus IS 250 westbound on the highway at about 6:15 p.m. when his car veered into an eastbound lane and struck an oncoming Honda Civic. The driver of the Honda – later identified as Oakley resident Ryan Joshua Aquino Amigable – died at the scene.
Family and friends remembered Amigable as “a loving big brother and son” in an obituary and GoFundMe page last July. They said he was 21 years old when he died, although the Alameda County Coroner’s Bureau reported he was 22.
“Ryan was a good person and the best big brother,” the family wrote. “He never wanted to go out so he could be safe at home. All he did was work, stay home, and spend his time in his room posing his action figures, which was his hobby and he loved doing it. Heartbroken does not begin to describe how the family feels right now.”
The day after the crash, CHP officials revealed that their investigation indicated the Lexus was engaged in a speed contest with a GMC Sierra. It is unclear whether the third driver was ever identified.
In a probable cause declaration filed with the court, CHP Officer Gerardo Barajas described talking to witnesses who said the Lexus and GMC pickup looked to be racing westbound on the highway. The officer added that some bystanders had video footage of the Lexus driving recklessly right before the crash.
“The GMC and the Lexus were traveling at a high rate of speed passing unsafely other motor vehicles,” Barajas wrote. “Subsequently, the Lexus lost control and went head-on onto the Honda.”
Guitierrez Delgadillo sustained serious injuries and was airlifted to Regional Medical Center in San Jose, according to the officer. The CHP said the next day that they were looking for the public’s help in locating the GMC pickup and identifying that driver.
The DA’s office charged Guitierrez Delgadillo with felony vehicular manslaughter with gross negligence on June 8. His arraignment is set for 9 a.m. July 9 at the East County Hall of Justice in Dublin. The case was filed against the defendant with the non-traditional spelling of Guitierrez.
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