Overview

• Full name: Rebecca Rodriguez
• Nickname: Becky
• Age at disappearance: 16
• Date of birth: March 29, 1961
• Date last seen: July 16, 1977
• Last known location: Brentwood Park, Brentwood, Contra Costa County, California
• Case classification: Endangered Missing; suspicious circumstances
• Current status: Missing; unresolved
• Investigating agency: Contra Costa County Sheriff’s Office
• NamUs identification number: MP12861
• Missing with: Evangeline Rodriguez Silva, 19, and Kenneth John Beltram, 25

Circumstances: Rebecca was last seen with her sister, Evangeline, and Evangeline’s boyfriend, Kenneth Beltram. The group reportedly planned to travel either to Oakley, California, or to Hogg Island. They left together in Beltram’s car and disappeared. The car was reportedly spotted later that month with an unidentified man driving, but the vehicle was never recovered.

Detailed Case Breakdown

Rebecca Rodriguez: The Unsolved 1977 Disappearance of a 16-Year-Old Girl and Two Companions in Brentwood, California

On July 16, 1977, 16-year-old Rebecca Rodriguez disappeared from Brentwood, California, along with her older sister and her sister’s boyfriend. The three had spent part of the evening at a local park before reportedly leaving together in a distinctive white Chevrolet. Nearly five decades later, the circumstances surrounding their disappearance remain unresolved.

The case involves three missing people, a vehicle that reportedly appeared nearly two weeks later with an unidentified driver, and unanswered questions about what happened after the group left Brentwood Park.

Although the circumstances have long been considered suspicious, Rebecca Rodriguez has not been publicly confirmed to be a homicide victim. Her case remains documented as an endangered missing-person investigation.

Case Summary

• Full name: Rebecca Rodriguez
• Nickname: Becky
• Age at disappearance: 16
• Date of birth: March 29, 1961
• Date last seen: July 16, 1977
• Last known location: Brentwood Park, Brentwood, Contra Costa County, California
• Case classification: Endangered Missing; suspicious circumstances
• Current status: Missing; unresolved
• Investigating agency: Contra Costa County Sheriff’s Office
• NamUs identification number: MP12861
• Missing with: Evangeline Rodriguez Silva, 19, and Kenneth John Beltram, 25

Circumstances: Rebecca was last seen with her sister, Evangeline, and Evangeline’s boyfriend, Kenneth Beltram. The group reportedly planned to travel either to Oakley, California, or to Hogg Island. They left together in Beltram’s car and disappeared. The car was reportedly spotted later that month with an unidentified man driving, but the vehicle was never recovered.

Sources: The Charley Project – Rebecca Rodriguez; Uncovered – Rebecca Rodriguez.

Rebecca Rodriguez’s Background and Life Before Her Disappearance

Rebecca Rodriguez, known to friends and family as Becky, was born on March 29, 1961. She was 16 years old when she disappeared during the summer of 1977.

According to The Charley Project, Rebecca was approximately 5 feet 2 inches tall and weighed 110 pounds. She had brownish-red hair and hazel eyes.

Rebecca’s older sister, Evangeline Rodriguez Silva, was also missing from the same incident. Evangeline, nicknamed Bungy, was 19 years old. She was described as approximately 5 feet 2 inches tall, weighing 115 pounds, with brown hair and brown eyes.

The sisters had relatives in Mexico. However, available case accounts do not establish that either woman traveled there after disappearing.

Publicly accessible case profiles provide limited information about Rebecca’s childhood, education, friendships, or personal aspirations. Those details should not be assumed or reconstructed without reliable documentation.

What is established is that Rebecca’s disappearance was not an isolated incident. Her sister and a third person vanished in connection with the same series of events, making the investigation considerably more complicated.

July 16, 1977: The Disappearance at Brentwood Park

On the evening of Saturday, July 16, 1977, Rebecca was at Brentwood Park with her older sister, Evangeline, and Evangeline’s boyfriend, Kenneth John Beltram.

According to published missing-person accounts, the three told people at the park that they intended to go either to Hogg Island or back home to Oakley, California.

The two sisters were last seen entering Beltram’s vehicle with him.

The vehicle was a pearl-white 1960 Chevrolet, described as having distinctive mag wheels and a large dent in the tailgate door. Its California license plate was CCJ 775.

The group apparently departed together, but the available records do not establish which destination they actually chose.

There is no publicly verified account confirming that Rebecca or Evangeline arrived in Oakley or reached Hogg Island.

The disappearance of three people traveling together raised questions that have never been conclusively answered.

Source: Rebecca Rodriguez – The Charley Project.

The Reported Sighting of Kenneth Beltram

One of the most unusual details in the case concerns a reported sighting of Kenneth Beltram after the sisters disappeared.

According to The Charley Project, Beltram’s brother reportedly saw him the following morning, July 17, 1977.

Rebecca and Evangeline were not with him.

This report creates an important distinction in the disappearance timeline. Although all three were together on July 16, the reported sighting suggests Beltram may have been seen separately afterward.

However, the public case summary does not establish where the encounter occurred, what Beltram told his brother, or whether investigators independently corroborated the account.

The sighting should therefore be treated as a reported witness account, not proof of what happened to the sisters.

Beltram is also listed as a missing person. His profile identifies him as 25 years old at the time of the disappearance.

Source: Kenneth John Beltram – The Charley Project.

Late July 1977: A Mysterious Sighting of the Chevrolet

Another significant development reportedly occurred in late July 1977, nearly two weeks after Rebecca and Evangeline were last seen.

Friends of Kenneth Beltram reportedly observed his distinctive Chevrolet being driven by an unidentified white man.

According to the account reproduced by Uncovered, this reported sighting occurred in Concord, California.

The witnesses reportedly attempted to catch up with the vehicle but were unsuccessful.

The car subsequently disappeared from public view.

The vehicle’s reported identifying characteristics were:

• Make and year: 1960 Chevrolet
• Color: Pearl white
• California license plate: CCJ 775
• Wheels: Mag rims
• Distinctive damage: Large dent in the tailgate door

These details remain potentially important because the car may have been connected to the group’s movements after leaving Brentwood Park.

Nevertheless, no publicly verified evidence establishes the unidentified driver’s identity, how he obtained the vehicle, or whether he had any involvement in the disappearances.

The sighting is an investigative lead reported in secondary case summaries, not a confirmed identification of a suspect.

Investigation History and Available Evidence

The Contra Costa County Sheriff’s Investigation

The Contra Costa County Sheriff’s Office is identified by The Charley Project as the investigating agency.

Rebecca’s disappearance is classified as endangered missing, and the circumstances involving all three individuals have been described as suspicious.

The publicly available accounts establish several potentially important lines of inquiry: the group’s movements after leaving Brentwood Park, Beltram’s reported appearance the following morning, and the subsequent sighting of his Chevrolet.

However, detailed records of the original investigation are not readily available in the reviewed public sources.

There is no verified public inventory of evidence collected in 1977, nor a complete published account of interviews, searches, investigative findings, or subsequent cold-case reviews.

The absence of these details from publicly accessible sources does not establish that investigators failed to pursue them.

The Missing Chevrolet

Beltram’s vehicle is one of the most distinctive elements of the investigation.

Unlike an ordinary vehicle description, the reported combination of its pearl-white finish, mag wheels, tailgate damage, and license plate could potentially help distinguish it from other Chevrolet vehicles of the same era.

The reported sighting in Concord is particularly relevant because the car was allegedly being driven by someone other than Beltram.

However, publicly available sources do not establish whether the vehicle was stolen, transferred, concealed, destroyed, or abandoned.

No verified public report reviewed for this article confirms that the Chevrolet has been recovered.

Physical Evidence and Forensic Testing

Modern missing-person investigations may use DNA comparisons, fingerprint records, dental records, and genetic genealogy to establish identities or investigate possible connections to unidentified remains.

The California Department of Justice maintains a Missing Persons DNA Program that compares information from missing individuals and their relatives with unidentified persons and remains.

That statewide capability does not establish that any particular forensic procedure has been performed in Rebecca’s case.

For Rebecca Rodriguez specifically, the reviewed public sources do not confirm:

• Collection or testing of family-reference DNA
• Use of investigative genetic genealogy
• Recovery of physical evidence associated with the disappearance
• Identification of remains belonging to Rebecca or her companions
• A publicly announced forensic match
• Recovery of the missing Chevrolet

These are gaps in publicly verified information, not proof that the investigative steps never occurred.

Source: California Department of Justice – Missing Persons.

Missing-Person Databases and Public Awareness

Rebecca’s disappearance has been documented by The Charley Project, Uncovered, and other missing-person resources.

Her NamUs reference is MP12861, as recorded by Uncovered. The same source identifies July 16, 1977, as her disappearance date.

The Charley Project’s profile also preserves Rebecca’s physical description, information about her companions, and the distinctive vehicle.

These databases serve an important public-awareness function by keeping historical disappearances accessible to people who may possess relevant information.

Community discussion has continued as well. A Websleuths discussion opened on March 17, 2018, revisited the circumstances of the disappearance.

Such discussions can help maintain awareness, but speculation by forum participants should not be treated as verified investigative findings.

Theories and Unresolved Questions

Because the three individuals disappeared under unusual circumstances, the case has prompted questions about possible foul play.

However, no publicly verified evidence reviewed for this article establishes a specific crime, perpetrator, or motive.

Did the Group Reach Its Intended Destination?

The group reportedly mentioned two possible destinations: Hogg Island and Oakley.

There is no verified public account establishing which route they took or whether they reached either location.

Their movements after leaving the park remain one of the central unanswered questions.

Why Was Beltram Reportedly Seen Without the Sisters?

The reported July 17 sighting of Beltram raises questions about when and where the three individuals may have separated.

The account does not establish why Rebecca and Evangeline were absent, whether Beltram knew their whereabouts, or what happened afterward.

It would be inappropriate to interpret the sighting alone as evidence of Beltram’s involvement in a crime.

Beltram himself remains listed as missing.

Who Was Driving the Chevrolet in Late July?

The unidentified man reportedly seen driving Beltram’s Chevrolet is another unresolved element.

If the sighting was accurate, the driver may have had information about the vehicle’s whereabouts after the disappearances.

But the publicly available information does not identify him or establish any criminal involvement.

There is also no verified explanation for why the vehicle was never subsequently located.

Could the Three Disappearances Have a Common Explanation?

Because Rebecca, Evangeline, and Beltram were together shortly before they vanished, it is reasonable to investigate their cases as potentially connected.

That connection does not prove that all three experienced the same fate or disappeared at exactly the same time.

The available record does not establish whether an accident, criminal act, voluntary departure, or some combination of circumstances explains what occurred.

Without additional evidence, no single theory can responsibly be presented as the answer.

Latest Publicly Available Investigative Updates (As of October 18, 2026)

A review of accessible missing-person databases, case profiles, law enforcement resources, and community discussions did not locate a publicly confirmed recent investigative breakthrough in Rebecca Rodriguez’s disappearance.

The following dated records help establish the publicly documented history of the case.

January 28, 2019: Charley Project Profile Update

The Charley Project records January 28, 2019, as the last update to Rebecca’s case profile, with changes to the disappearance details.

This is a database maintenance date. It is not evidence that investigators discovered new information on that date.

April 3, 2024: Uncovered Case Record Update

Uncovered lists April 3, 2024, as the last update to its Rebecca Rodriguez case page.

The profile continues to describe the July 1977 disappearance, the reported sighting of Beltram, and the subsequent vehicle sighting.

The update does not document an arrest, forensic identification, or recovery.

2025–2026: No Confirmed Public Breakthrough Located

As of October 18, 2026, the reviewed sources did not establish any newly announced arrest, criminal charges, confirmed recovery of remains, forensic identification, or resolution of Rebecca’s disappearance.

No verified public announcement of new DNA results, genetic genealogy findings, or a newly identified suspect was located.

No publicly confirmed recent investigative developments were located. This does not rule out investigative work that has not been publicly disclosed.

Rebecca’s case remains unresolved in the available public records.

Conclusion: Three Missing People and Nearly Five Decades of Questions

Rebecca Rodriguez was only 16 years old when she vanished from Brentwood, California, on July 16, 1977.

Her older sister, Evangeline Rodriguez Silva, and Kenneth John Beltram also disappeared in connection with that evening.

The reported sighting of Beltram the following morning and the later sighting of his Chevrolet remain among the most important details preserved in public accounts.

But those reports have never produced a publicly documented explanation for what happened.

The passage of time makes the case more difficult, yet historical missing-person investigations can still benefit from witnesses coming forward, old photographs or documents being located, and previously unknown information being shared with investigators.

Anyone who remembers the group at Brentwood Park, recognizes the distinctive pearl-white Chevrolet, or has information about its reported appearance in Concord in late July 1977 may have information worth reporting.

The Contra Costa County Sheriff’s Office identifies its Investigations Division as a contact for investigative information and tips. Its current published telephone number is (925) 313-2600, and its anonymous tip line is (866) 846-3592. Official Sheriff’s Tip Information.

Rebecca, Evangeline, and Kenneth deserve to be remembered as people whose lives and futures mattered, not simply as names in a decades-old missing-person record.

Until reliable evidence establishes what happened, the central question remains unanswered: What became of the three people who left Brentwood Park in July 1977?