# Costa Mesa Woman Convicted in 2022 Laguna Beach Hit-and-Run That Killed Stanley Isaacs, 60, on His Anniversary > An Orange County jury on Sept. 10, 2026 convicted Sysillia Kianna Morrison Montes De Oca, 22, of Costa Mesa, on three felonies plus a fleeing enhancement for the Aug. 11, 2022 hit-and-run at South Coast Highway and Pearl Street in Laguna Beach that killed Stanley Isaacs, 60. Sentencing is scheduled for Nov. 13, 2026. - Canonical: https://ocint.app/situation/laguna-beach-coast-hwy-pearl-hit-and-run-conviction-2026-09 - Markdown: https://ocint.app/situation/laguna-beach-coast-hwy-pearl-hit-and-run-conviction-2026-09.md - JSON: https://ocint.app/api/situations/laguna-beach-coast-hwy-pearl-hit-and-run-conviction-2026-09 - Status: active - As of: 2026-09-28T23:05:11.587+00:00 - Started: 2026-09-10T20:00:00+00:00 - Cities: Laguna Beach - Publisher: OCINT (https://ocint.app) ## Who / What / Where / When / Why **Who:** Defendant Sysillia Kianna Morrison Montes De Oca, 22, of Costa Mesa; victim Stanley Isaacs, 60; his wife Catherina Isaacs; prosecuted by Deputy DA Justin Kim. **What:** Jury conviction on three felonies plus a fleeing enhancement for a fatal pedestrian hit-and-run; sentencing set for Nov. 13, 2026. **Where:** South Coast Highway and Pearl Street, Laguna Beach; case tried in Orange County Superior Court. **When:** Crash occurred Aug. 11, 2022 at approximately 9:38 p.m.; jury verdict Sept. 10, 2026; sentencing scheduled Nov. 13, 2026. **Why:** Prosecutors alleged Montes De Oca was speeding and under the influence of marijuana when she struck the couple in a marked crosswalk, then fled the scene. ## Narrative ## Current Status Sysillia Kianna Morrison Montes De Oca, 22, of Costa Mesa, stands convicted following an Orange County jury verdict on Sept. 10, 2026. She faces sentencing on three felonies — gross vehicular manslaughter, hit-and-run causing permanent and serious injury, and failing to stop at a hit-and-run with injury or death — plus an enhancement for fleeing the scene of a vehicular manslaughter. Sentencing is scheduled for **Nov. 13, 2026**, according to the Orange County Register. ## The Crash On Aug. 11, 2022, at approximately 9:38 p.m., Isaacs and his wife Catherina were crossing South Coast Highway at Pearl Street in a marked, lighted crosswalk after an anniversary dinner at Ristorante Rumari when they were struck by a 2009 Volkswagen Jetta. Isaacs sustained an internal decapitation, skull fracture, severed spine, and crushed ribs; he died of his injuries. His wife suffered moderate injuries. ## Evidence at Trial According to Deputy District Attorney Justin Kim, Montes De Oca — who was 18 at the time — had used marijuana that evening and told passengers she planned to speed up before the impact. After the collision, prosecutors said she returned to the scene, searched online about fatal hit-and-runs, and hid the Jetta in an Aliso Viejo garage. She surrendered to police on Aug. 12, 2022. ## What Comes Next The case moves to a sentencing hearing set for Nov. 13, 2026. This page will be updated when a sentence is imposed. ## Timeline - **2022-08-12T04:38:00Z:** Aug. 11, 2022, about 9:38 p.m.: Stanley Isaacs, 60, and his wife are struck in a lighted crosswalk at South Coast Highway and Pearl Street after an anniversary dinner; the driver flees. Isaacs dies of his injuries. - **2022-08-12T20:00:00Z:** Aug. 12, 2022: Montes De Oca surrenders to police after the Jetta is found hidden in an Aliso Viejo garage. - **2026-09-10T20:00:00Z:** An Orange County jury convicts Montes De Oca of gross vehicular manslaughter and two hit-and-run felonies with a fleeing enhancement. ## Primary sources 1. [KTLA: Orange County woman convicted in hit-and-run crash that killed man celebrating anniversary with his wife](https://ktla.com/news/california/hit-and-run-driver-convicted-man-killed-oc/) (2026-09-13T02:08:11+00:00) 2. [Verdict Sept. 10: three felonies plus fleeing enhancement; prosecutors cite speed, marijuana and hidden car](https://www.ocregister.com/2026/09/10/woman-convicted-in-laguna-beach-hit-and-run-that-killed-man-celebrating-anniversary/) ## Factoids - **Verdict Sept. 10: three felonies plus fleeing enhancement; prosecutors cite speed, marijuana and hidden car** (source_doc) ([source](https://www.ocregister.com/2026/09/10/woman-convicted-in-laguna-beach-hit-and-run-that-killed-man-celebrating-anniversary/)): A jury on Sept. 10, 2026 found Sysillia Kianna Morrison Montes De Oca, 22, of Costa Mesa (18 at the time of the crash), guilty of gross vehicular manslaughter, hit-and-run causing permanent and serious injury, and failing to stop at a hit-and-run with injury or death, with an enhancement for fleeing the scene of a vehicular manslaughter. Deputy District Attorney Justin Kim told jurors she was speeding in a 2009 Volkswagen Jetta, had used marijuana that evening and told passengers she planned to speed up before striking Stanley Isaacs, 60, and his wife Catherina in a marked, lighted crosswalk at South Coast Highway and Pearl Street about 9:38 p.m. on Aug. 11, 2022, as they walked from an anniversary dinner at Ristorante Rumari. Isaacs suffered an internal decapitation, a skull fracture, a severed spine and crushed ribs; his wife had moderate injuries. Prosecutors said she later returned to the scene, searched online about fatal hit-and-runs, hid the car in an Aliso Viejo garage and surrendered on Aug. 12, 2022. A sentencing date was not reported. - **Sentencing set for Nov. 13, 2026** (source_doc) ([source](https://www.ocregister.com/2026/09/10/woman-convicted-in-laguna-beach-hit-and-run-that-killed-man-celebrating-anniversary/)): Sysillia Kianna Morrison Montes De Oca, 22, of Costa Mesa (18 at the time of the crash), was convicted Sept. 10, 2026 of gross vehicular manslaughter, hit-and-run causing permanent serious injury and failing to stop at a hit-and-run with injury or death, plus a fleeing enhancement; Deputy DA Justin Kim prosecuted. Stanley Isaacs, 60, of Costa Mesa was killed about 9:38 p.m. Aug. 11, 2022 at South Coast Highway and Pearl Street; his wife Catherina Isaacs was injured. Sentencing is set for Nov. 13, 2026. --- 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.