Overview

• Full Name: Jasen Michael Demello
• Also Known As: Jasen Michael Briggs
• Date of Birth: January 10, 1972
• Age at Disappearance: 24 years old
• Date Last Seen: March 1, 1996
• Last Known Location: Bay Point, California
• County: Contra Costa County
• State: California
• Case Classification: Missing Person
• Publicly Documented Status: Unresolved; remains listed in missing-person records
• Investigating Agency: Contra Costa County Sheriff’s Department
• California DOJ Case Number: SP9721746

The central question in Jasen’s case is what happened after he was last seen in Bay Point. Available records do not establish whether he left voluntarily, experienced an accident, encountered foul play, or disappeared under other circumstances. His case should therefore be treated as an unresolved disappearance rather than a confirmed homicide.

Detailed Case Breakdown

Case Summary

Jasen Michael Demello was 24 years old when he disappeared from Bay Point, California, on March 1, 1996. More than three decades later, his whereabouts remain unknown in publicly available missing-person records. Although his disappearance has been documented by the California Department of Justice and missing-person organizations, very little information about the circumstances leading up to his disappearance has been released publicly.

• Full Name: Jasen Michael Demello
• Also Known As: Jasen Michael Briggs
• Date of Birth: January 10, 1972
• Age at Disappearance: 24 years old
• Date Last Seen: March 1, 1996
• Last Known Location: Bay Point, California
• County: Contra Costa County
• State: California
• Case Classification: Missing Person
• Publicly Documented Status: Unresolved; remains listed in missing-person records
• Investigating Agency: Contra Costa County Sheriff’s Department
• California DOJ Case Number: SP9721746

The central question in Jasen’s case is what happened after he was last seen in Bay Point. Available records do not establish whether he left voluntarily, experienced an accident, encountered foul play, or disappeared under other circumstances. His case should therefore be treated as an unresolved disappearance rather than a confirmed homicide.

Background and Circumstances of the Disappearance

Jasen Michael Demello was born on January 10, 1972. At the time he went missing, he was a young adult whose disappearance would become a long-standing unresolved case in Contra Costa County, California.

Publicly accessible records provide limited information about Jasen’s personal life. His employment, education, family circumstances, and daily activities before his disappearance have not been reliably established in the sources reviewed. These gaps make it difficult to reconstruct his final known movements or understand what may have happened to him.

Physical Description and Identifying Characteristics

At the time of his disappearance, Jasen was described as a white male standing approximately six feet tall and weighing about 185 pounds. He had brown hair and green eyes.

Several distinctive physical characteristics may help identify him. He reportedly had a birthmark on his abdomen, a scar on his left cheek, and a tattoo depicting a skull and a knife on his upper arm. He may also have used the surname Briggs, and California’s official missing-person listing identifies him under the additional name Jasen Michael Briggs.

These identifying features remain important because a person’s appearance can change significantly over time. Permanent scars, birthmarks, and tattoos may provide useful information when evaluating possible sightings or unidentified-person records.

March 1, 1996: Last Seen in Bay Point

Jasen was last seen in Bay Point, an unincorporated community in Contra Costa County in the eastern San Francisco Bay Area, on March 1, 1996. He was 24 years old.

Publicly available case summaries do not identify the precise location of his last confirmed sighting, the time of day he disappeared, or the identity of the last person known to have seen him. They also do not establish what clothing he was wearing, whether he had access to a vehicle, or where he intended to go.

After that date, Jasen was not heard from again, according to his published missing-person profile. The lack of publicly documented circumstances has made his disappearance particularly difficult to understand from the information available outside law enforcement.

Investigation History and Available Evidence

The Contra Costa County Sheriff’s Department is identified as the investigating agency in Jasen’s missing-person records. The California Department of Justice also maintains a listing for him in its statewide missing-person database.

The California listing identifies the official case number as SP9721746. This reference can help distinguish Jasen’s disappearance from other missing-person investigations and may be useful when submitting information to the appropriate authorities.

What Is Known About Investigative Efforts?

The public record confirms that Jasen’s disappearance was documented by law enforcement and entered into missing-person information systems. However, the sources reviewed do not provide a detailed history of the original investigation.

No reliable public account was located describing specific searches, witness interviews, recovered personal belongings, surveillance evidence, or forensic examinations associated with his disappearance. This does not establish that such investigative work never occurred; it means those details could not be verified through the publicly available material reviewed.

Physical and Forensic Evidence

There is no publicly verified description of physical evidence recovered in connection with Jasen’s disappearance in the reviewed sources. Similarly, no confirmed public information was located establishing whether investigators collected family reference DNA, obtained fingerprints for comparison, or conducted forensic testing connected to his case.

No case-specific announcement was located describing a genetic genealogy breakthrough, identification of remains, or forensic result that resolved the question of Jasen’s whereabouts.

Missing-Person Records and Public Awareness

Jasen’s case has appeared in the California Department of Justice missing-person database and The Charley Project, an independent organization that documents long-term missing-person cases. These listings preserve essential identifying information and provide ways for people with relevant knowledge to locate investigative contacts.

The continued availability of these records helps keep Jasen’s name and physical description accessible to the public. However, the appearance or updating of a missing-person profile should not be mistaken for evidence of a new investigative development.

Theories and Unresolved Questions

Because the circumstances surrounding Jasen’s disappearance have not been publicly explained in detail, there is insufficient verified evidence to establish a particular theory about what happened to him.

There is no publicly confirmed basis in the reviewed material to conclude that Jasen was abducted, murdered, deliberately went into hiding, or experienced a fatal accident. Each of those possibilities would require evidence that has not been established in the available case record.

Questions That Remain Unanswered

One of the most important unanswered questions is where Jasen was last seen on March 1, 1996, and who may have interacted with him that day. Public records do not establish his final destination, his means of transportation, or whether anyone witnessed circumstances that appeared unusual.

Another unresolved question concerns the events immediately after his disappearance. Available public accounts do not explain when concern was first raised, when the missing-person report was filed, or what information investigators received during the earliest stages of the case.

It is also unknown from the reviewed sources whether investigators have received credible sightings, examined possible connections to unidentified remains, or revisited historical evidence using newer investigative methods.

These are unanswered investigative questions, not indications that particular events occurred. Without additional verified information, assigning a motive, identifying a suspect, or claiming a specific explanation would be speculation.

Latest Publicly Available Investigative Updates

As of October 30, 2026, Jasen Michael Demello continues to appear in publicly accessible missing-person records maintained by the California Department of Justice and independent missing-person resources. No publicly confirmed recent investigative breakthrough was located in the sources reviewed for this article.

The reviewed information does not establish any recent arrest, criminal charge, identification of remains, confirmed sighting, or official resolution of Jasen’s disappearance.

No recent case-specific announcement from the investigating agency was located confirming a new search operation, cold-case review, DNA identification, or other significant investigative development. This should not be interpreted as proof that the case is receiving no investigative attention, since law enforcement may conduct work that is not publicly disclosed.

Although community awareness posts and missing-person directories have continued to circulate information about Jasen, republication of an existing profile is not itself evidence of a new lead.

For now, the central facts remain unchanged: Jasen disappeared from Bay Point on March 1, 1996, and the publicly available information reviewed does not establish what happened to him afterward.

Conclusion and Public Appeal for Information

The disappearance of Jasen Michael Demello remains an unresolved mystery more than 30 years after he was last seen in Bay Point, California. He was only 24 years old when he vanished, and the limited public record leaves fundamental questions about his final known movements unanswered.

Jasen’s identifying characteristics, including his green eyes, left-cheek scar, abdominal birthmark, and skull-and-knife tattoo, may help someone recognize him or recall information relevant to the investigation. The alternative surname Briggs may also be important when reviewing historical records or memories of encounters from that period.

Anyone who knew Jasen, encountered him around March 1, 1996, or possesses information about his whereabouts is encouraged to contact the Contra Costa County Sheriff’s Department at 925-646-2441. Information can also be provided through the California Department of Justice missing-person hotline at 1-800-222-3463.

Even information that appears minor may be relevant when considered alongside records unavailable to the public. Tips should be shared directly with law enforcement rather than circulated as unverified accusations or speculation.

Jasen Michael Demello’s disappearance deserves continued attention, careful reporting, and an evidence-based effort to determine what happened. Until reliable information establishes his fate, his case remains an unanswered missing-person investigation.