Diego Sierra, a 20-year-old Latino male, tragically lost his life on March 5, 2025, in Whittier, California. The young man was pronounced dead at 10:35 p.m. while in an ambulance after suffering a gunshot wound to the neck. Authorities have classified his death as a homicide. The incident unfolded late Wednesday night, prompting an immediate response from law enforcement and emergency medical personnel.
The shooting occurred on Newlin Avenue, just north of Walnut Street and south of Mar
Vista Street. Reports indicate that Diego Sierra was inside a white Tesla when gunfire erupted from an apartment area along the west sidewalk of the street. After being struck, the vehicle continued east on Mar Vista Street and then south on Greenleaf Avenue before coming to a stop near a fire station. Emergency responders arrived swiftly, but Diego Sierra was already beyond medical aid. At least two ambulances were dispatched to the scene, with indications that another individual may have been wounded in the attack.
Family members rushed to the location upon hearing the news, with emotional outbursts and distress audible over emergency radio communications. As the night progressed, a large gathering of relatives formed at the intersection of Walnut Street and Greenleaf Avenue. At approximately 11:45 p.m., a third individual, possibly a family member, was transported from the scene after experiencing a severe anxiety attack.
Authorities have yet to release details regarding any arrests or suspects connected to the homicide. The Whittier Police Department is leading the investigation, working to determine the circumstances surrounding the fatal shooting. While local law enforcement has reported multiple arrests in the area in recent days, none appear to be directly linked to Diego Sierra’s case. The community remains on edge as detectives continue their search for answers in this tragic loss of life.
