Rebecca Becky Rodriguez was 16 when she was last seen on the evening of July 16, 1977, in Brentwood, California. She was with her older sister, 19-year-old Evangeline Silva, and Silva’s boyfriend, Kenneth John Beltram. The three had spent time in Brentwood Park and told others they were heading either to Oakley or Hogg Island; Rebecca and her sister were last seen getting into Beltram’s car.

Beltram was reportedly seen the next morning without the two women, and neither he nor the sisters were ever heard from again. His pearl-white 1960 Chevrolet with a large dent was spotted weeks later being driven by an unidentified man, but the vehicle and its occupants vanished before they could be traced. Searches turned up no significant leads, and authorities describe the circumstances as suspicious.

The case remains open with the Contra Costa County Sheriff’s Department seeking information that could help resolve what happened that night. Did anyone in the Brentwood, Oakley, or Hogg Island area see Rebecca, Evangeline, Beltram, or that distinctive Chevrolet around July 16–17, 1977?