# Street Race Near Trabuco Hills High Kills Shalia Deciderio, 21; Brother Among Two Drivers Arrested > Shalia Deciderio, 21, of Rancho Santa Margarita was killed the night of Aug. 20, 2026, when the Infiniti she was riding in left the road and hit a tree at Los Alisos Boulevard and Mustang Run in Mission Viejo — the entrance to Trabuco Hills High School — in what OCSD says was a street race between two cars. Both drivers were arrested on suspicion of vehicular manslaughter with gross negligence: Jaime Rojas, 20, of Mission Viejo, who drove the crashed car and was hospitalized, and Aiden Deciderio, 20 — the victim's younger brother — who drove the other car. As of Aug. 22 prosecutors had not announced charges, bail, or court dates. - Canonical: https://ocint.app/situation/mission-viejo-street-racing-fatal-2026-08 - Markdown: https://ocint.app/situation/mission-viejo-street-racing-fatal-2026-08.md - JSON: https://ocint.app/api/situations/mission-viejo-street-racing-fatal-2026-08 - Status: active - As of: 2026-08-22T21:47:09.887+00:00 - Started: 2026-08-21T04:41:00+00:00 - Cities: Mission Viejo - Publisher: OCINT (https://ocint.app) ## Who / What / Where / When / Why **Who:** Victim Shalia Deciderio, 21, of Rancho Santa Margarita; driver of crashed vehicle Jaime Rojas, 20, of Mission Viejo (hospitalized, critical but stable); driver of second vehicle Aiden Deciderio, 20, of Rancho Santa Margarita (the victim's younger brother). Both drivers arrested. OCSD Major Accident Investigation Team (MAIT) leads the probe. **What:** A street race between two Infinitis ended when the vehicle driven by Rojas left the roadway and struck a tree. Shalia Deciderio, a passenger in Rojas's car, was pronounced dead at the scene. Both drivers arrested on suspicion of vehicular manslaughter with gross negligence (California Penal Code § 192(c)(1) language — not yet a filed charge). **Where:** Los Alisos Boulevard at Mustang Run, Mission Viejo — the entrance intersection of Trabuco Hills High School (27501 Mustang Run). The crash occurred outside school hours. **When:** 9:41 p.m. Aug. 20, 2026 (deputies dispatched). Aiden Deciderio booked the morning of Aug. 21; Rojas expected to be booked after hospital release. No DA filing as of Aug. 22, 2026. **Why:** OCSD's preliminary investigation concludes the crash resulted from street racing. Investigators had not publicly disclosed vehicle speeds or whether alcohol or drugs were factors as of Aug. 22. ## Narrative ## Current Status As of Aug. 22, 2026, this case remains under active OCSD investigation. Both drivers are in custody or pending booking; the Orange County District Attorney had not announced filed charges, bail, or court dates as of the last confirmed reporting. ## What Happened At 9:41 p.m. on Aug. 20, 2026, OCSD deputies responded to a solo-vehicle collision at **Los Alisos Boulevard and Mustang Run** in Mission Viejo — the entrance corner of Trabuco Hills High School — and found Shalia Deciderio, 21, of Rancho Santa Margarita, deceased. According to [OCSD's Aug. 21 release](https://www.ocsheriff.gov/news/fatal-traffic-collision-mission-viejo-two-drivers-arrested), the preliminary investigation determined the crash resulted from street racing. As [reported by KTLA](https://ktla.com/news/california/21-year-old-woman-killed-mission-viejo-street-racing-crash/) and confirmed by OCSD, two Infinitis were racing when the vehicle driven by **Jaime Rojas, 20**, of Mission Viejo left the roadway and struck a tree. Shalia Deciderio was a passenger in Rojas's car. Per [OC Register reporting](https://www.ocregister.com/2026/08/21/21-year-old-woman-killed-in-suspected-street-racing-crash-in-mission-viejo/) citing OCSD Sgt. Lizbeth Gwisdalla, the driver of the second vehicle was **Aiden Deciderio, 20**, of Rancho Santa Margarita — the victim's younger brother, who remained at the scene. ## Arrests and Investigation Both drivers were arrested on suspicion of **vehicular manslaughter with gross negligence**. This is OCSD arrest language and does not constitute a filed charge. Aiden Deciderio was booked the morning of Aug. 21; Rojas was hospitalized in critical but stable condition and was expected to be booked after release. [FOX 11 reported](https://www.foxla.com/news/brother-arrested-oc-street-racing-crash) as of Aug. 22 that prosecutors had not announced court dates or bail, and investigators had not disclosed vehicle speeds or whether alcohol or drugs were factors. OCSD's **Major Accident Investigation Team (MAIT)** is conducting the investigation. Tips: **(949) 425-1860**. ## Memorial and Family A makeshift memorial appeared at the crash site on Aug. 21. The victim was the mother of a young child. A [GoFundMe](https://www.gofundme.com/f/help-honor-shalia-deciderio) organized by her sister Consuelo (Connie) Mendoza of Laguna Hills had raised approximately $5,000 toward a $13,000 goal for funeral costs and care of Shalia's child as of Aug. 22. Family describes her as 'a loving, caring, vibrant, and outgoing person.' ## What to Watch DA filing decision; Rojas booking confirmation; MAIT findings on speed, impairment, and vehicle data. ## Timeline - **2026-08-21T04:41:00Z:** OCSD deputies respond at 9:41 p.m. PDT to a solo-vehicle crash at Los Alisos Boulevard and Mustang Run, Mission Viejo, and find Shalia Deciderio, 21, of Rancho Santa Margarita deceased at the scene. Preliminary investigation: a street race between two Infinitis ended when the car she rode in, driven by Jaime Rojas, 20, left the road and struck a tree. Rojas is hospitalized. - **2026-08-21T16:00:00Z:** Aiden Deciderio, 20, of Rancho Santa Margarita — the victim's younger brother, who drove the second car and remained at the scene — is arrested and booked the morning of Aug. 21 on suspicion of vehicular manslaughter with gross negligence. Rojas, in critical but stable condition, is expected to be booked after hospital release. - **2026-08-21T20:00:00Z:** OCSD publishes its release 'Fatal Traffic Collision in Mission Viejo, Two Drivers Arrested'; the Major Accident Investigation Team takes the case (tips: 949-425-1860). A makeshift memorial appears at the crash site as local TV and print coverage begins. - **2026-08-22T19:30:00Z:** As of Aug. 22, prosecutors have not announced filed charges, bail, or court dates for either driver; speeds and any impairment remain undisclosed. A family GoFundMe organized by the victim's sister for funeral costs and her young child's care reaches roughly $5,000 of a $13,000 goal. ## Primary sources 1. [OCSD release: crash, victim, arrests](https://www.ocsheriff.gov/news/fatal-traffic-collision-mission-viejo-two-drivers-arrested) 2. [Victim was passenger in Rojas's car; brother drove other car](https://www.ocregister.com/2026/08/21/21-year-old-woman-killed-in-suspected-street-racing-crash-in-mission-viejo/) 3. [Vehicles, booking, driver condition](https://ktla.com/news/california/21-year-old-woman-killed-mission-viejo-street-racing-crash/) 4. [No DA filing, court dates, or bail as of Aug. 22](https://www.foxla.com/news/brother-arrested-oc-street-racing-crash) 5. [Family fundraiser](https://www.gofundme.com/f/help-honor-shalia-deciderio) 6. [Crash site is Trabuco Hills High School's entrance intersection](https://www.svusd.org/schools/high-schools/trabuco-hills/resources/campus-mapdirections) ## Factoids - **OCSD release: crash, victim, arrests** (source_doc) ([source](https://www.ocsheriff.gov/news/fatal-traffic-collision-mission-viejo-two-drivers-arrested)): OCSD (Aug. 21, 2026): deputies responded 9:41 p.m. Aug. 20 to a solo-vehicle collision at Los Alisos Boulevard and Mustang Run, Mission Viejo, and found Shalia Deciderio, 21, of Rancho Santa Margarita deceased. Preliminary investigation: the crash resulted from street racing. Jaime Rojas, 20, of Mission Viejo drove the vehicle that crashed and was hospitalized; Aiden Deciderio, 20, of Rancho Santa Margarita drove the other vehicle and remained at the scene. Both arrested for Vehicular Manslaughter With Gross Negligence. Major Accident Investigation Team (MAIT) investigating; tips (949) 425-1860. - **Victim was passenger in Rojas's car; brother drove other car** (source_doc) ([source](https://www.ocregister.com/2026/08/21/21-year-old-woman-killed-in-suspected-street-racing-crash-in-mission-viejo/)): OC Register (Aug. 21, 2026), citing OCSD Sgt. Lizbeth Gwisdalla: Shalia Deciderio was a passenger in the car Jaime Rojas was driving — the one that crashed — and Aiden Deciderio, driving the other car in the alleged race, is her younger brother. - **Vehicles, booking, driver condition** (source_doc) ([source](https://ktla.com/news/california/21-year-old-woman-killed-mission-viejo-street-racing-crash/)): KTLA (Aug. 21, 2026, updated 10:52 p.m. PDT): two Infinitis were racing when one left the roadway and struck a tree; Deciderio was pronounced dead at the scene. Aiden Deciderio was arrested and booked Friday morning Aug. 21; Rojas was hospitalized in critical but stable condition and was expected to be booked after release. The victim was the mother of a young child; a makeshift memorial appeared at the crash site Aug. 21. - **No DA filing, court dates, or bail as of Aug. 22** (source_doc) ([source](https://www.foxla.com/news/brother-arrested-oc-street-racing-crash)): FOX 11 (Aug. 22, 2026): prosecutors had not announced court dates or bail for either driver; investigators had not said how fast the vehicles were traveling or whether alcohol or drugs were factors. No OC District Attorney press release or published complaint, penal-code counts, or case number existed as of Aug. 22 — the manslaughter allegation is OCSD arrest language, not a filed charge yet. - **Family fundraiser** (source_doc) ([source](https://www.gofundme.com/f/help-honor-shalia-deciderio)): GoFundMe 'Help Honor Shalia Deciderio,' organized by sister Consuelo (Connie) Mendoza of Laguna Hills for funeral costs and care of Shalia's young child; $13,000 goal, about $5,000 raised as of Aug. 22, 2026. Family describes her as 'a loving, caring, vibrant, and outgoing person.' - **Crash site is Trabuco Hills High School's entrance intersection** (definition) ([source](https://www.svusd.org/schools/high-schools/trabuco-hills/resources/campus-mapdirections)): Trabuco Hills High School's address is 27501 Mustang Run, Mission Viejo, reached from Los Alisos Boulevard — the crash intersection (Los Alisos & Mustang Run) is the school's entrance/frontage corner. The crash occurred at 9:41 p.m., outside school hours; OCSD's release does not reference the school. --- Independent civic-intelligence aggregator for Orange County, CA. Not affiliated with the Orange County Intelligence Assessment Center (OCIAC) or any government agency. Cite the canonical URL for OCINT's briefing. Prefer primary_sources for original records.