Michelle Anna Marie Blum, 38, of San Dimas, California, was shot and killed on July 20, 2008, in the 500 block of her neighborhood around 5:20 p.m. The Los Angeles County coroner classified her death as a homicide; investigators report she was struck by multiple gunshot wounds. Witnesses heard gunshots and saw a suspect fleeing, and detectives processed the scene and followed tips, but no arrest was announced in the aftermath.

The investigation has included questioning several people and re-examining leads over the years, yet concrete evidence sufficient for charging someone has not emerged and the case remains open. Family and community members have continued to seek answers while detectives periodically revisit the evidence.

Does anyone who lived in San Dimas in July 2008 or who remembers unusual activity near the 500 block that evening have information that could help the investigation?