An Oakland cyclist’s death near the Coliseum in late 2024 has led to felony charges more than a year later, after what authorities describe in court filings as a data-heavy, months-long investigation.
Court records state that 24-year-old Mateo Hernandez was arrested on Dec. 13 and charged in the hit-and-run death of bicyclist Reggie Warren, who was struck while riding through a crosswalk near the Oakland Coliseum on Nov. 23, 2024. Prosecutors have charged Hernandez with vehicular manslaughter with gross negligence and with leaving the scene of an accident that caused death. He is being held without bail at the county jail and is scheduled to enter a plea on Jan. 8, 2026, according to The Mercury News.
According to court filings, investigators leaned heavily on technology to get there. The case file describes a trail of license-plate reader hits, cellphone data, and community tips that eventually pointed to a suspect vehicle and then to Hernandez himself.
The Alameda County Sheriff’s Office operates Santa Rita Jail in Dublin, the facility where felony arrestees are typically booked and held while their cases move through the Superior Court. The sheriff’s office manages custody and booking for Alameda County cases while judges and prosecutors handle the legal proceedings.
How Investigators Tied the Honda Civic to Hernandez
Court records indicate that automated license-plate reader cameras captured an image of a Honda Civic that investigators linked to the collision. Those records led detectives to Hernandez’s residence, where they recovered the Civic on May 2, according to filings cited by The Mercury News. The car was registered to a relative, according to the documents.
Detectives also pulled Hernandez’s cellphone records and followed up on tips that he had allegedly admitted involvement in the crash. Those leads, detailed in the case file, formed part of the basis for a warrant that ultimately led to his arrest.
Victim and the Scene
Court records identify the victim as 59-year-old Reggie Warren. He was struck while riding in a marked crosswalk at Baldwin Street and Hegenberger Road, near the Oakland Coliseum, at about 8:04 p.m. on Nov. 23, 2024, and later died of his injuries.
Advocates have long flagged that stretch of East Oakland as dangerous for people walking and biking, pointing to fast-moving traffic on major corridors such as Hegenberger Road. That broader pattern of fatal and serious crashes in Oakland has been documented by The Oaklandside.
Legal Stakes
Hernandez faces a felony count of vehicular manslaughter with gross negligence and a separate count for leaving the scene of a deadly collision. Under California law, vehicular manslaughter with gross negligence can lead to several years in state prison, depending on the facts of the case and how prosecutors choose to charge it, according to legal summaries from Shouse Law. Court records list Jan. 8, 2026, as Hernandez’s next court date, when he is scheduled to enter a plea in Alameda County Superior Court.
What Happens Next
Hernandez is expected to return to court for arraignment and subsequent pretrial hearings while the Alameda County District Attorney’s Office reviews reports and other evidence to determine how to proceed.
Police and prosecutors have asked anyone with information about the collision to contact investigators as the case moves forward through the courts.
