Man Sentenced in Prosecution for DUI-related Death of Rio Mesa High School Student

VENTURA, California – District Attorney Gregory D. Totten announced today that defendant Mario Adan Arjon (DOB 12/18/1990), of Ventura, was sentenced to seven years eight months in state prison, following his November 2017 conviction for gross vehicular manslaughter while intoxicated, driving with a blood alcohol content of 0.15 percent or higher, driving under the influence of alcohol causing injury to multiple victims. 

In the early morning of June 15, 2017, defendant was driving at a high rate of speed on Central Avenue outside Rio Mesa High School in Oxnard, when he rear-ended a vehicle that had slowed to stop at Vineyard Avenue.  The car defendant stuck was being driven by Fernando Buenrostro, a senior at Rio Mesa who had just returned from a sober graduation night at Disneyland.  The impact of the collision forced Mr. Buenrostro’s car into a car stopped in front of him, and rotated Mr. Buenrostro’s car into the intersection.  Mr. Buenrostro was transported to Ventura County Medical Center where he died three days later.   Mr. Buenrostro’s passengers, two high school students also returning from “grad night,” were also injured, along with the driver of the third vehicle.  An investigation by the California Highway Patrol determined that the defendant’s blood alcohol concentration at the scene was 0.15, almost twice the legal limit. 


The Ventura County District Attorney’s Office is the public prosecutor for the county’s 850,000 residents. The office employs approximately 280 employees including attorneys, investigators, victim advocates, and other professional support staff who strive to seek justice, ensure public safety, and protect the rights of crime victims.

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