Overview

Last Seen: Official NamUs-derived listings use November 1, 1969.

Location: El Cajon, California, with NamUs-derived accounts stating Marvin was last seen at his sister’s residence.

Important date discrepancy: The Charley Project lists Marvin as missing since December 1, 1969, and reports that his sister last spoke with him sometime in December 1969 or January 1970. Because these records conflict, November 1, 1969 should be treated as the official database date rather than proof that it was the final confirmed contact.

Main circumstances: Marvin reportedly told his sister he was attempting to obtain work as a crew member aboard a boat in Ventura or at Santa Barbara Harbor. After that period, he stopped communicating with his family and was never heard from again.

Current status: Missing. Marvin was legally declared dead in 2000, but that declaration does not establish when, where, or how he died. No publicly documented remains have been identified as his, and no homicide determination has been publicly announced.

Detailed Case Breakdown

Marvin Blake Shahan Disappearance: California Man Missing Since 1969

Marvin Blake Shahan was 25 years old when he disappeared from Southern California in 1969. More than five decades later, his whereabouts remain unknown, and publicly available records continue to classify him as a missing person.

Shahan was living in El Cajon, California, around the time he vanished. His case ultimately became associated with Ventura County because, shortly before contact with his family ended, he reportedly discussed trying to find work aboard a boat in either Ventura or Santa Barbara Harbor.

Very Brief Case Summary

Last Seen: Official NamUs-derived listings use November 1, 1969.

Location: El Cajon, California, with NamUs-derived accounts stating Marvin was last seen at his sister’s residence.

Important date discrepancy: The Charley Project lists Marvin as missing since December 1, 1969, and reports that his sister last spoke with him sometime in December 1969 or January 1970. Because these records conflict, November 1, 1969 should be treated as the official database date rather than proof that it was the final confirmed contact.

Main circumstances: Marvin reportedly told his sister he was attempting to obtain work as a crew member aboard a boat in Ventura or at Santa Barbara Harbor. After that period, he stopped communicating with his family and was never heard from again.

Current status: Missing. Marvin was legally declared dead in 2000, but that declaration does not establish when, where, or how he died. No publicly documented remains have been identified as his, and no homicide determination has been publicly announced.

Marvin Blake Shahan’s Disappearance

Marvin Blake Shahan was described as a white male with brown hair and brown eyes. At the time of his disappearance, he stood approximately 5 feet 9 inches tall and weighed about 160 pounds. He wore thick eyeglasses and had a distinctive horseshoe-shaped birthmark on his thigh.

NamUs-derived records identify November 1, 1969, as his date of last contact and El Cajon as the place from which he disappeared. Veteran Doe, which maintains information about missing veterans and active-duty military personnel, similarly lists November 1 and states that Marvin was last seen at his sister’s residence in El Cajon.

There is, however, an important conflict in the surviving information.

The Charley Project reports that Marvin’s sister last spoke with him sometime during December 1969 or January 1970, when both were living in El Cajon. During that conversation, Marvin reportedly told her that he was trying to obtain a job working on the crew of a boat, possibly in Ventura or at Santa Barbara Harbor.

That conversation may represent a later contact than the formal November 1 date recorded in NamUs-derived databases. With records originating more than half a century ago, the precise chronology remains uncertain.

The Search for Work Along the California Coast

Marvin’s reported plans to find work aboard a boat are among the most significant known details in his disappearance.

Ventura and Santa Barbara are both located northwest of El Cajon along the Southern California coast. If Marvin followed through with his stated plans, he could potentially have traveled away from San Diego County before disappearing.

What happened after his discussion with his sister is unknown.

There is no publicly documented confirmation that Marvin actually reached Ventura, Santa Barbara Harbor, or any specific vessel. No publicly available account identifies a boat owner, captain, employer, marina, coworker, traveling companion, or individual who definitively encountered him there.

His family never heard from him again.

Questions About the Original Missing-Person Report

Another complication is the timing of the official investigation.

According to The Charley Project, someone in Marvin’s family contacted local police after he disappeared, but surviving information does not establish whether a formal missing-person report was actually entered at that time.

That distinction is significant in a case dating to 1969.

Without an immediate formal investigation, authorities may not have been able to preserve employment records, interview witnesses while memories were fresh, trace transportation, examine possible marina records, or establish Marvin’s movements during the period immediately following his last family contact.

Decades later, those investigative opportunities became much more difficult to reconstruct.

Declared Legally Dead and Reported Missing Decades Later

Marvin was declared legally dead in 2000, approximately three decades after he vanished. A legal declaration of death following a prolonged disappearance does not establish a cause or manner of death and does not mean that remains were recovered.

His sister formally reported him missing on March 10, 2003, according to The Charley Project.

Marvin was subsequently entered into modern missing-person resources, including the National Missing and Unidentified Persons System.

His NamUs identification number is MP51388.

Marvin Shahan and Military Service

Veteran Doe identifies Marvin Blake Shahan as a missing veteran and includes him in its collection of missing veterans and active-duty military personnel.

The site reproduces the NamUs information stating that he was 25 years old, 5 feet 9 inches tall, approximately 160 pounds, and missing from El Cajon beginning November 1, 1969.

Publicly indexed case material reviewed for this article does not provide enough verified information to responsibly state Marvin’s military branch, rank, unit, dates of service, or discharge status.

Latest Publicly Available Investigation Information

Marvin remains listed in contemporary missing-person and cold-case resources, and there has been no publicly announced resolution of his disappearance.

Current publicly indexed material continues to identify the Ventura County Sheriff’s Office as the investigating agency. A contemporary cold-case listing directs anyone with information relating to Marvin’s disappearance to the Ventura County Cold Case Unit at (805) 383-8739.

The Charley Project separately lists the Ventura County Sheriff’s Department at (805) 383-8704. Its Marvin Shahan case page was added in 2021 and continues to describe his fate as unknown.

A search of publicly available and indexed case information through August 29, 2026 did not locate an announced recovery of Marvin’s remains, an identified suspect, an arrest, a confirmed homicide finding, or a publicly announced forensic-genealogy result specifically involving his case.

That does not mean investigators have taken no action. Cold-case agencies do not make every investigative step public.

The Ventura County Sheriff’s Cold Case Unit continues to investigate decades-old cases and has demonstrated the use of renewed evidence reviews and modern DNA techniques in other historical Ventura County investigations. Those developments show what is now technologically possible, but there is currently no public evidence establishing that such testing has produced a breakthrough in Marvin’s case.

Why Marvin Blake Shahan’s Case Remains Unsolved

The largest obstacle is time.

The disappearance occurred in 1969, and surviving information suggests uncertainty about whether a formal missing-person investigation began immediately. The available chronology itself is inconsistent, with NamUs-derived sources identifying November 1, 1969, while another account indicates Marvin remained in contact with his sister into December 1969 or possibly January 1970.

His plan to seek maritime employment also potentially expanded the geographical scope of the investigation from El Cajon to Ventura, Santa Barbara and possibly other California coastal communities.

More than 55 years later, a previously unknown witness, family document, photograph, employment record, military record, marina connection, unidentified-person comparison, or genetic identification could still provide information capable of changing the case.

For now, the central question remains unanswered: What happened to Marvin Blake Shahan after he left or lost contact with his family in 1969 or early 1970?