A SoCal school is being sued by the parents of a 9th grader who died in a parking lot accident

Campbell Hall, a private K-12 school in Studio City, is being sued by two popular musicians after their 15-year-old son was pinned between two cars in the school’s parking lot earlier this year.

Cosmo Silverman was killed on June 4 after the ninth grader was hit by a green Rivian SUV and rear-ended by a white SUV while crossing the parking lot minutes after school.

The lawsuit, filed Tuesday in Los Angeles County Superior Court, says the school failed to improve parking lot security despite previous complaints from parents about how it handled student dismissals.

“The school was informed by the community, by the parents of the school, that the parking lot is not safe,” said Robert Glassman, an attorney representing Cosmo parents. “They knew there was a problem.”

Cosmo, according to the suit, was 15 at the time and had just finished ninth grade when he was killed. He was the son of married musicians Adam Silverman and Louise Bonnet, who are plaintiffs in the lawsuit.

“During his tragically short life, he left an indelible mark on his family, friends, and everyone who was fortunate enough to know him,” the suit reads. For Adam and Louise, their son’s death wasn’t just a loss of life, it was the loss of every heartbeat that filled their home with joy, every dream they’d watched come true, and every moment of happiness they counted on sharing.”

Officials with Campbell Hall did not immediately respond to requests for comment.

Campbell Hall is a private Episcopal school whose famous alumni include Ashley and Mary-Kate Olsen; Dakota and Elle Fanning; and Jrue, Aaron and Justin Holiday.

Cosmo’s parents said students had to walk in traffic lanes in a parking lot with no crosswalks, and that the school’s pick-up protocol violated state laws.

Security footage from June 4 captured the scene, along with a Rivian SUV and a white SUV in the school parking lot before the crash.

(Panish | Shea | Ravipudi LLP)

On the day of the incident, the Los Angeles Police Department received a call at 3:10 p.m. about a vehicle that had hit a pedestrian at the school, according to a department spokesperson. Cosmo was rushed to the hospital where he was pronounced dead.

Two additional children and three adults suffered non-life threatening injuries, according to the Los Angeles Fire Department.

Since Cosmo’s death, the school has changed the way students are picked up, the lawsuit said.

“Prior to this incident, students used to enter many roads to reach parked cars or go to their parents to pick them up,” the case continued. “Cosmo was one of the students who were walking in the line of cars running and stopping when he was shot and killed.”

The lawsuit also states that parents expressed concern about the maintenance of the school’s parking lot during the loading period, and that school employees who usually help direct traffic in the parking lot were not present on June 4.

“There were no adults to babysit,” Glassman said.

Glassman said the decision to file a lawsuit came after Cosmo’s parents were “stonewalled” by the school’s insurance company, unable to reach a resolution.

“The case was not filed out of anger, but out of necessity,” he said.

Since then the school has made several changes, according to the suit, including a fence separating the van line from the adjacent lawn, a crosswalk, and a stop sign in front of the sidewalk, among other changes.

“If these safety measures had been implemented before June 4, 2025, Cosmo and his classmates would not have been able to get into the cars waiting in the pick-up line after school, and this tragedy would have been avoided,” the lawsuit said. “The circumstances that led to this tragedy were completely predictable.”