Full Notification

DATE/TIME: September 18, 2021 / 5:57 p.m.

INCIDENT: Fatal Traffic Collision

LOCATION: Adelanto Road / Air Expressway, Adelanto

SUSPECT(S): Involved Party #1, Ysidro Pinon, 21-year-old male, Adelanto resident, silver 2011 Ford Fusion

VICTIM(S): Involved Party #2, April Lyon, 41-year-old female, Adelanto resident, tan 1999 Chevy Tahoe 

UPDATE:  THURSDAY, APRIL 22, 2022, AT 8:00AM

In December of 2021, Deputy K. Riberich of the San Bernardino County Sheriff’s Departments Major Accident Investigation Team (MAIT) submitted a report to the San Bernardino County District Attorney’s Office.  Pinon's blood test results revealed he had alcohol and cannabinoids (marijuana) in his system. 

On March 25, 2022, the San Bernardino County District Attorney’s Office filed charges of Penal Code 191.5(a), Vehicular Manslaughter with Gross Negligence While Intoxicated, and Vehicle Code 23152(g), Driving Under the Influence of Alcohol and Drugs Resulting in Injury. The court issued a $500,000 arrest warrant for Pinon.

On Thursday, April 14, 2022, Pinon and his attorney went to the courthouse, and Pinon was remanded into custody.  His first court appearance was scheduled for April 21, 2022.  Court proceedings continue and Pinon remains in custody.  

SUMMARY: On Saturday, September 18, 2021, at 5:57 p.m., deputies from the Victor Valley Station’s Major Accident Investigation Team (MAIT) responded to a fatal traffic collision at the intersection of Adelanto Road and Air Expressway in Adelanto.  The victim, April Lyon, drove west on Air Expressway, east of Adelanto Road. Lyon's husband sat in the front passenger seat while her 6-year-old son sat in the rear seat behind Lyon's husband.

Independent witnesses said westbound Air Expressway's traffic light was green, and northbound Adelanto Road's traffic light was red. The driver of a silver 2011 Ford Fusion, later identified as Ysidro Pinon, drove north on Adelanto Road, south of Air Expressway, and failed to stop for the red traffic light.  Pinon broadsided Lyon's vehicle on the driver's side causing Lyon's vehicle to roll over an unknown number of times. Lyon was ejected from her vehicle and was pronounced dead at the scene. Lyon's husband and son were airlifted to Loma Linda University Hospital for major injuries. 

Pinon sustained moderate injuries and refused to be medically transported. 

Further investigation is needed to determine whether alcohol and/or drugs was a factor in the collision.  

Anyone with information regarding this investigation is urged to contact the Victor Valley Station at 760-552-6800.  Callers wishing to remain anonymous should contact the We-Tip Hotline at 1-800-78-CRIME (27463) or visit wetip.com.  


Refer: Deputy Kevin Riberich

Station: Victor Valley Station, Major Accident Investigation Team (MAIT)

Phone No. 760-552-6800

Case No. 242102084

SHANNON D. DICUS, Sheriff-Coroner
San Bernardino County Sheriff-Coroner Department