# 83-Year-Old Pedestrian Killed at Portola Parkway and Market Place in Lake Forest; Driver Arrested on Suspicion of DUI > An 83-year-old Lake Forest man was struck and killed near Portola Parkway and Market Place about 8 p.m. on Sept. 10, 2026; the driver, Sean Micheal Kooklin, 48, of Lake Forest, was arrested on suspicion of DUI and booked into Orange County Jail. The OCSD Major Accident Investigation Team's inquiry remains open, the victim has not been publicly named, and no OCDA charges had been announced as of Sept. 28. - Canonical: https://ocint.app/situation/lake-forest-portola-pedestrian-dui-death-2026-09-10 - Markdown: https://ocint.app/situation/lake-forest-portola-pedestrian-dui-death-2026-09-10.md - JSON: https://ocint.app/api/situations/lake-forest-portola-pedestrian-dui-death-2026-09-10 - Status: active - As of: 2026-09-28T22:56:13.331+00:00 - Started: 2026-09-11T03:00:00+00:00 - Cities: Lake Forest - Publisher: OCINT (https://ocint.app) ## Who / What / Where / When / Why **Who:** Victim: an 83-year-old man from the Lake Forest area (name withheld pending next-of-kin notification). Driver arrested: Sean Michael Kooklin, 48, of Lake Forest. Investigating agency: OCSD Major Accident Investigation Team. **What:** A fatal pedestrian collision in which an 83-year-old man was struck by a vehicle driven by a suspect later arrested for DUI; the victim died at a hospital. **Where:** Portola Parkway and Market Place, Lake Forest, Orange County, California. **When:** Collision occurred at approximately 8 p.m. Thursday, Sept. 10, 2026. OCSD issued its public release on Sept. 11. No charges had been filed as of Sept. 15. **Why:** OCSD arrested the driver on suspicion of driving under the influence; the formal cause of the crash remains under investigation by the Major Accident Investigation Team. ## Narrative ## Current Status The OCSD Major Accident Investigation Team is continuing its investigation into the Sept. 10, 2026 fatal pedestrian collision at Portola Parkway and Market Place in Lake Forest. As of Sept. 15, no criminal charges had been filed by the Orange County District Attorney's office. No new developments have been reported since the initial OCSD release. ## What Happened At approximately 8 p.m. on Thursday, Sept. 10, 2026, deputies responded to a collision at Portola Parkway and Market Place in Lake Forest. An 83-year-old man from the area — KTLA reported he was walking at the time — was struck by a vehicle. He was transported to a hospital with severe injuries and later pronounced dead. The driver, identified as Sean Michael Kooklin, 48, of Lake Forest, was arrested at the scene on suspicion of driving under the influence and booked into Orange County Jail. ## Investigation The OCSD [Major Accident Investigation Team](https://ocsheriff.gov/news/fatal-traffic-collision-lake-forest-driver-arrested-dui-1) is handling the case. The victim's name was withheld pending next-of-kin notification. No OCDA charges had been announced as of Sept. 15, 2026. **Witnesses** with information are asked to contact the Major Accident Investigation Team at **949-425-1860**. Anonymous tips may be submitted to OC Crime Stoppers at **855-TIP-OCCS**. ## Timeline - **2026-09-11T03:00:00Z:** About 8 p.m. Thursday Sept. 10: an 83-year-old pedestrian is struck near Portola Parkway and Market Place in Lake Forest and later dies at a hospital; deputies arrest the driver, Sean Michael Kooklin, 48, of Lake Forest, on suspicion of DUI. - **2026-09-11T22:03:00Z:** OCSD issues its release on the fatal collision, withholding the victim's name pending next-of-kin notification and asking witnesses to contact the Major Accident Investigation Team. ## Primary sources 1. [KTLA: Elderly man struck and killed by suspected DUI driver in Orange County](https://ktla.com/news/california/elderly-man-killed-by-suspected-dui-driver/) (2026-09-13T03:14:28+00:00) 2. [OCSD: Fatal Traffic Collision in Lake Forest, Driver Arrested for DUI](https://ocsheriff.gov/news/fatal-traffic-collision-lake-forest-driver-arrested-dui-1) (2026-09-11T22:03:56+00:00) ## Factoids - **OCSD release (Sept. 11): 83-year-old pedestrian killed, Sean Michael Kooklin, 48, booked on suspicion of DUI** (source_doc) ([source](https://ocsheriff.gov/news/fatal-traffic-collision-lake-forest-driver-arrested-dui-1)): OCSD's Sept. 11, 2026 release says deputies responded at 8 p.m. Thursday, Sept. 10 to Portola Parkway and Market Place in Lake Forest, where an 83-year-old man from the area had been struck by a vehicle; he was taken to a hospital with severe injuries and pronounced dead. The driver, Sean Michael Kooklin, 48, of Lake Forest, was arrested on suspicion of driving under the influence and booked into Orange County Jail. The victim's name was withheld pending next-of-kin notification. The Major Accident Investigation Team (949-425-1860) is handling the case; anonymous tips to OC Crime Stoppers at 855-TIP-OCCS. KTLA (Sept. 12) reported the victim was walking when struck. No OCDA charges had been announced as of Sept. 15. --- 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.