A California family reached a $27 million settlement with the San Moreno Valley Unified School District on Wednesday, four years after 13-year-old Diego Stolz was punched to death at his middle school on Sept. 16, 2019.

Two 14-year-old boys, who were 13 at the time of the incident, pleaded guilty to charges of manslaughter and assault in juvenile court, and a Riverside County judge sentenced them to 47 days in jail plus community service and therapy.

The Stolz family's legal counsel at Taylor & Ring LLP described Wednesday's settlement as the largest ever "in a school bullying case in the United States."

"Diego was, by all accounts, the sweetest nicest kid you could ever meet. When the bullies confronted him yet again (for no good reason), Diego put his hands to his side because he was told to never fight at school. The two bullies sucker-punched him and killed him," his attorneys wrote in a Facebook post Wednesday.

CALIFORNIA BOY, 13, COMPLAINED OF BULLYING AT SCHOOL DAYS BEFORE FATAL SUCKER PUNCH, ATTORNEY SAYS

Diego Stolz poses in front of a birthday cake

Diego Stolz, 13, died nine days after being sucker-punched at his middle school in September 2019. (Taylor & Ring LLP)

The wrongful death lawsuit that the Stolz family filed against the school district said Diego complained to school administrators about the bullying and that they did not take appropriate action to stop it.

CALIFORNIA STUDENTS CHARGED WITH MANSLAUGHTER IN BEATING OF 13-YEAR-OLD WHO LATER DIED, REPORTS SAY

"The school had promised Diego and his family the prior week that the boys would be disciplined and suspended. They weren't," Taylor & Ring said in their statement. "The following Monday when Diego came to his middle school, they killed him. We hope this case is a [wake-up] call to all schools in the U.S. – take your anti-bullying policies seriously, and when a student complains, take action. You have a duty to protect kids at school."

Diego Stolz' family gathers during a 2019 press conference

Two 14-year-old boys, who were 13 at the time of the incident, pleaded guilty to charges of manslaughter and assault in juvenile court, and a Riverside County judge sentenced them to 47 days in jail plus community service and therapy. (Gina Ferazzi / Los Angeles Times)

The entire incident was captured on video and shared across social media. The juvenile bullies punched Diego once from behind, causing him to fall and hit his head against a concrete pillar, at which point they continued to punch him.

CALIFORNIA STUDENT, 13, DECLARED BRAIN DEAD FROM INJURIES SUSTAINED DURING MIDDLE SCHOOL FIGHT

Diego died of a brain injury nine days later.

A framed photo of Diego Stolz

The $27 million lawsuit that Diego Stolz's family reached four years after his death is described as the largest school bullying settlement in U.S. history. (Gina Ferazzi / Los Angeles Times)

"Regarding anti-bullying efforts … there have been many changes that have happened these past few years," Moreno Valley Unified School District Superintendent Dr. Martinrex Kedziora said in a Wednesday letter to family and school staff. "A few of those changes include a district-wide centralized online bullying form; distribution of classroom posters regarding the definition of bullying, types of bullying and how to report it; distribution of business cards with a QR code to report bullying; shortcuts on student Chromebooks that will go directly to the online bullying form; and updates of district and school websites to feature videos, links and resources regarding bullying."

Kedziora continued, "On behalf of the Moreno Valley Unified School District Board of Education, we want you to know that we truly care about each and every student and staff member in our district. The news of Diego’s death was not something we took lightly. The safety and well-being of our students will remain our top priority."

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The sheriff’s department announced in September 2019 that Stolz’s family had donated his organs "to transform this tragedy into the gift of life for other children."

Talia Kaplan and the Associated Press contributed to this report.