Archie Williams Student-Athlete Sienna Katz, 16, Dies in Car Accident, Leaving Her Parents Behind!

April 21, 2026

This article was last updated by Aditi Rai on April 21, 2026

A 16-year-old student and athlete of Archie Williams High School, Sienna Katz, passed away on April 18, 2026, in a tragic single-vehicle accident in Marin County, California, alongside her three best friends, while two others survived.

On the evening of April 18, 2026, a devastating single-vehicle accident in Marin County, California, claimed the lives of four Archie Williams High School students and left two others critically injured.

Among the four victims was Sienna Katz, a beloved member of the San Anselmo community, who took her last breath.

Alongside Katz, the other two victims of the tragic accident, a 14-year-old Olive Koren, a 16-year-old Josalynn “Josy” Osborn, were pronounced dead at the scene. Whereas, a 15-year-old was transported to a nearby hospital but succumbed to her injuries shortly after.

GoFundMe campaigns have been set up for most of the girls to support their families during this difficult time.

Olive Koren’s mother, , updated her profile picture to one featuring Olive after the accident. The campaign for Olive has raised $44,790 so far, nearing its $50K goal.

One of the four victims of the tragic accident was Olive Koren. (Image Source: )

Josy Osborn is survived by her mother, Christie. The campaign for Josy has collected over $108k, with a target of $120k.

Ada Kepley survived by her parents, Linda and Kirk, and her older brother Dylan. The campaign for Ada has surpassed its $50K goal.

In addition to the four girls, two others were on the ride, but they survived the crash. The two survivors, and , were hospitalized in critical condition, fighting for their lives in the days following the crash.

One of two survivors of the Marin County crash, Elsa. (Image Source: )

One of two survivors, Marley Barclay, is reportedly in the hospital with a partially collapsed lung, internal injuries, and face and neck injuries.

, the mother of Marley Barclay, took to her Facebook to share a post requesting financial assistance to support Marley’s recovery. She wrote:

I am so grateful my precious Marley is alive but I am truly devastated for the other girls. Thank you to everyone who has reached out, doesn’t go unnoticed.

A account has been created to help Marley’s family during this difficult time. The account has already amassed over $100k, with a target of $140k.

The crash, which occurred on San Geronimo Valley Road near Woodacre, has sparked an outpouring of grief on social platforms.

According to the California Highway Patrol (CHP), the incident took place around 7:40 p.m. when a westbound Volkswagen Tiguan, carrying six teenage girls, went off San Geronimo Valley Road, just south of Sir Francis Drake Boulevard.

The SUV collided with a tree and subsequently caught fire, creating a harrowing scene for first responders.

During this difficult time, we offer our deepest condolences to the families of Sienna, Olive, Josalynn, and Ada Kepley, and we pray for Elsa and Marley’s speedy recovery.

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Aditi is an avid music lover whose interest's goes beyond the realm of music, with passion in digital marketing. A Gen Z who loves her personal space and is keen to exploring new things. An optimist who seeks silver lining in every circumstances life throws at her.

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