The Unsolved Abduction and Murder of Cosette Ann Ellison: A Haunting Mystery in Contra Costa County

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A Promising Young Life Cut Short

On March 3, 1970, 15-year-old Cosette Ann Ellison vanished from her hometown of Moraga, California, under circumstances that have baffled investigators for decades. Born on March 16, 1954, in Alameda County, Cosette was a bright and vibrant teenager with a future full of potential. Her sudden disappearance and the subsequent discovery of her body have left a lasting impact on the community and continue to raise questions about the identity of her killer.

The Day of Disappearance

Cosette's routine on that fateful day seemed typical. She was last seen disembarking from her school bus at approximately 3:20 p.m., directly in front of her residence on Canyon Road. The bus driver, Eugene Yee, observed Cosette retrieving mail from the family's mailbox before proceeding toward the house. Notably, Yee also recalled seeing an unfamiliar man seated in a truck near the Ellison residence during his return route, a detail that would later become a focal point in the investigation.

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