Rosa Mejia Obituary, Death; Woman loses her life in multi-vehicle crash in Diamond Bar.

Freeman Nonny

Rosa Mejia Obituary, Death – Authorities have identified the woman who lost her life in a multi-vehicle collision early Sunday morning on the Orange (57) Freeway in Diamond Bar, California. The Los Angeles County Medical Examiner’s Office confirmed that the victim was 35-year-old Rosa Mejia. Officials said Mejia was pronounced deceased at the scene, though her city of residence has not been released.

According to the California Highway Patrol (CHP), the crash took place around 3:15 a.m. on the northbound lanes of the 57 Freeway, just south of the interchange with the Pomona (60) Freeway. The circumstances that led to the crash are still being investigated, and officers are working to determine how many vehicles were involved and what might have caused the collision.

Emergency responders, including firefighters and paramedics from the Los Angeles County Fire Department, were dispatched to the location shortly after the crash was reported. Fire officials said crews worked quickly to reach the vehicles involved, and Mejia was carefully extricated from one of them around 3:25 a.m. Despite the rapid response, she was pronounced deceased shortly afterward.

Following the crash, CHP officers temporarily closed all northbound lanes of the 57 Freeway to allow emergency personnel to work safely and to clear the wreckage. A Sigalert — a traffic advisory issued for major road closures — was put in place around 3:40 a.m. and lifted roughly 20 minutes later once lanes began reopening. Traffic in the area remained slow for some time as vehicles were removed and crews completed their cleanup operations.

Authorities have not released details about the number of other vehicles or people involved, nor have they reported any additional injuries. Investigators are examining whether speed, road conditions, or driver impairment may have played a role in the crash. Officers are also reviewing dashcam footage and interviewing witnesses to piece together the sequence of events that led to the fatal collision.

The early-morning incident occurred in a stretch of freeway that connects several major Southern California routes, often used by commuters traveling between Los Angeles, Orange, and San Bernardino counties. The area is known for its complex interchanges and steady traffic, even during overnight hours.

Residents and drivers familiar with the route expressed sadness upon learning of the accident. Many shared condolences online and reminded others to stay alert while driving, especially during early or late hours when visibility is lower and fatigue can affect reaction times.

The CHP’s Baldwin Park Office is leading the investigation. Officials have asked anyone who may have witnessed the crash or who was driving through the area around the time of the collision to contact investigators. They emphasized that even small details — such as noticing vehicles swerving, driving unusually fast, or making sudden lane changes — can help clarify what happened.

Authorities have also reminded the public of the importance of practicing caution on major highways, particularly at night. They encourage drivers to ensure they are well-rested, maintain a safe following distance, and avoid distractions such as mobile devices while behind the wheel.

As of Monday, no further information had been released about the cause of the crash or whether any citations or charges would be issued. The freeway has since fully reopened, and traffic has returned to normal in the area.

Family and friends of Rosa Mejia are mourning her loss, remembering her as a kind and caring person whose life ended far too soon. Local officials expressed sympathy to her loved ones and said their thoughts are with those affected by the tragedy.

The investigation remains ongoing, and the California Highway Patrol will release additional details once they are confirmed. Anyone with information is urged to contact CHP investigators.

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