[10-05-2025] Los Angeles County, CA – Woman Killed in Multi-Vehicle Crash on 57 Freeway in Diamond Bar

A 35-year-old woman, Rosa M., was killed in a multi-vehicle crash in Diamond Bar on Sunday, October 5, 2025.

According to the California Highway Patrol, the crash occurred around 3:15 a.m. on northbound Orange (57) Freeway just south of the Pomona (60) Freeway.

Firefighters and paramedics arrived at the scene and extricated Rosa from her vehicle at 3:25 a.m. She was pronounced dead at the scene by the Medical Examiner’s office.

Authorities continue to investigate the collision.

Contact Our Car Accident Lawyers In Diamond Bar, CA

Multi-vehicle accidents, particularly those resulting in fatalities, can have a profound impact on victims and their families. Understanding your legal rights after such a collision is important for navigating the process of seeking compensation for medical expenses, funeral costs, and other damages.

Car accident lawyers in Diamond Bar can help you explore the available legal options after a multi-vehicle collision. Legal support may include reviewing accident reports, assisting with insurance claims, and explaining how compensation may be pursued for medical expenses, lost wages, and other damages. Early legal guidance may help clarify the next steps and ensure your rights are protected.

If you or a loved one has been involved in a multi-vehicle accident, call us at (888) 488-1391 or fill out our “Do I Have a Case?” form for a free initial consultation.

What To Do After A Multi-Vehicle Accident In Diamond Bar, CA

Multi-vehicle collisions, especially those resulting in fatalities, can be traumatic for victims and families. Taking the right steps afterward may help protect your rights and preserve important evidence for future claims.

1. Call 911 And Seek Medical Attention
   Report the accident to emergency services immediately and ensure that anyone injured receives prompt medical evaluation. Even minor injuries should be assessed, as some may not be immediately visible.
2. Document The Scene And Damage
   If it is safe to do so, take photographs of the accident scene, vehicle damage, and any visible injuries. This documentation may be valuable for insurance claims and legal purposes.
3. Gather Information From Witnesses
   Collect the names and contact details from any witnesses to the collision. Their statements can provide important insight into the circumstances surrounding the accident.
4. Consult With Car Accident Lawyers
   A lawyer can help explain your legal options, assist with insurance matters, and ensure that time-sensitive evidence is preserved. Early legal involvement may help protect your rights and ensure the case is handled properly.

I HAD AN ACCIDENT

Car Accident Statistics

Traffic deaths in the United States fell during the first half of 2023, according to the National Highway Traffic Safety Administration (NHTSA). An estimated 19,515 people died in motor vehicle crashes during this period, about 3.3% fewer than the 20,190 deaths reported in the same timeframe in 2022. This marks the fifth consecutive six-month period with declining traffic fatalities, with decreases in both the first and second quarters.

The decline in deaths happened even as Americans drove more. Preliminary data show that total vehicle miles traveled increased by roughly 35.1 billion miles, a 2.3% rise compared with early 2022. Despite the higher volume of driving, the fatality rate improved, falling to 1.24 deaths per 100 million miles traveled, indicating ongoing progress in road safety.