Overview

Date: August 14, 1976

Location: Her home in Petaluma, Sonoma County, California

Age at disappearance: 29

Case status: Missing under suspicious circumstances; unresolved

The main circumstances are that Carlson was last known to be home, her subsequent whereabouts are unknown, and publicly accessible accounts do not establish what caused her disappearance. There is no verified public finding that she was murdered.

What Happened to Dianne Jane Carlson on August 14, 1976?

Dianne Jane Carlson was 29 years old when she disappeared from Petaluma, a city in Sonoma County in Northern California. Available case summaries place her last known whereabouts at her residence on August 14, 1976.

Her disappearance has been characterized as suspicious, but publicly available descriptions do not establish the exact time she was last seen, who last spoke with her, or whether investigators discovered physical evidence suggesting a crime.

There is also limited verified information about the initial police response, witness interviews, or searches conducted after she went missing. These gaps make it difficult to reconstruct her final known movements or determine what happened after she was last at home.

Detailed Case Breakdown

Dianne Jane Carlson: The Unsolved 1976 Disappearance of a 29-Year-Old Woman in Petaluma, California

Nearly 50 years after Dianne Jane Carlson disappeared from Petaluma, California, questions remain about what happened to the 29-year-old woman. Last known to be at her home on August 14, 1976, Carlson vanished under circumstances described as suspicious, leaving behind a missing-person case that remains unresolved.

Also known as Dianne Jane Jensen, Carlson is listed in national missing-person resources, including the National Missing and Unidentified Persons System (NamUs). Despite the passage of decades, publicly available information offers few answers about her disappearance.

Date and Location Last Seen

Date: August 14, 1976

Location: Her home in Petaluma, Sonoma County, California

Age at disappearance: 29

Case status: Missing under suspicious circumstances; unresolved

The main circumstances are that Carlson was last known to be home, her subsequent whereabouts are unknown, and publicly accessible accounts do not establish what caused her disappearance. There is no verified public finding that she was murdered.

What Happened to Dianne Jane Carlson on August 14, 1976?

Dianne Jane Carlson was 29 years old when she disappeared from Petaluma, a city in Sonoma County in Northern California. Available case summaries place her last known whereabouts at her residence on August 14, 1976.

Her disappearance has been characterized as suspicious, but publicly available descriptions do not establish the exact time she was last seen, who last spoke with her, or whether investigators discovered physical evidence suggesting a crime.

There is also limited verified information about the initial police response, witness interviews, or searches conducted after she went missing. These gaps make it difficult to reconstruct her final known movements or determine what happened after she was last at home.

Dianne Carlson’s Physical Description and Identifying Information

Missing-person information identifies Carlson as a white woman approximately 5 feet 4 inches tall and weighing 125 pounds at the time of her disappearance. Her hair was described as blonde.

She was also known by the name Dianne Jane Jensen, an important detail for anyone searching historical records or attempting to identify possible matches in missing-person databases.

A publicly discussed clothing description mentions a brown jacket, although the exact clothing details should be checked against her official NamUs record before being treated as confirmed.

Could Dianne Carlson Be Connected to an Unidentified Person Case?

In April 2023, a discussion on Reddit’s r/gratefuldoe community raised the possibility that Carlson could be connected to an unidentified woman found in Perry County in 1978.

The contributor compared the women’s estimated heights, weights, hair colors, clothing, and facial characteristics. Other participants discussed the perceived similarities and whether the comparison should be submitted to investigators.

This was an unverified online theory, not an officially established identification or investigative connection. The discussion provides no confirmation that forensic testing linked Carlson to the unidentified woman, and the resemblance alone cannot establish that they were the same person.

Latest Investigation Information and Case Developments (2026)

As of October 17, 2026, the publicly accessible sources reviewed do not establish that Dianne Carlson has been located, that an arrest has been made, or that her disappearance has been solved.

However, several developments have helped preserve awareness of her case.

On November 13, 2022, The Charley Project included Carlson in its case-update archive. On January 22, 2025, The Doe Network announced that her case had been added to its missing-person database under reference number 5004DFCA. These are documented case-publication developments, not evidence of new police investigative activity.

Carlson’s NamUs listing is associated with missing-person number MP97264. Her continued appearance in missing-person resources helps keep her information accessible to researchers, investigators, and people who may recognize details about her disappearance.

No verified public announcement was located confirming new DNA findings, identified suspects, charges, or a resolution of the case. The current status of any nonpublic police investigation would need to be confirmed directly with the responsible agency.

Why Dianne Carlson’s Disappearance Remains Unresolved

Carlson’s disappearance is particularly difficult to understand because so few details about her final known activities have been publicly documented.

There are unanswered questions about what happened at her residence, whether anyone witnessed her departure, and whether information collected in 1976 could provide new investigative leads today.

Her case remains an example of the challenges surrounding long-term missing-person investigations. Historical records, witness recollections, and possible comparisons with unidentified-person cases may be important, but any new lead requires official investigation and verification.

Nearly five decades after she was last known to be in Petaluma, Dianne Jane Carlson’s whereabouts remain unknown in the available public record.