Overview

Official date last seen: April 1, 1975
Official location: Palo Alto, California, reportedly from his parents’ home in the 4300 block of Miranda Avenue
Age: 19
Nickname: Kim
Status: Missing; case remains unresolved
Palo Alto Police case: 75-3251
NamUs: MP26846

Main circumstances: Armstrong reportedly walked away from his parents’ Palo Alto residence and did not return. His family said it was unlike him to disappear without contacting them. Historical material surrounding the case introduces a significant date discrepancy, however: while current official records use April 1, 1975, later discussions of contemporary newspaper coverage and a preserved 1978 archival record refer to events extending to approximately April 17, 1975.

Detailed Case Breakdown

Douglas Kimberly Armstrong Disappearance: The 1975 Palo Alto Missing Person Case

Douglas Kimberly Armstrong, known as “Kim,” was 19 years old when he vanished in Northern California in 1975. More than five decades later, Armstrong remains listed as a missing person by the California Department of Justice, and his disappearance remains associated with the Palo Alto Police Department under case number 75-3251. He is also listed in the National Missing and Unidentified Persons System as NamUs MP26846.

Brief Case Summary

Official date last seen: April 1, 1975
Official location: Palo Alto, California, reportedly from his parents’ home in the 4300 block of Miranda Avenue
Age: 19
Nickname: Kim
Status: Missing; case remains unresolved
Palo Alto Police case: 75-3251
NamUs: MP26846

Main circumstances: Armstrong reportedly walked away from his parents’ Palo Alto residence and did not return. His family said it was unlike him to disappear without contacting them. Historical material surrounding the case introduces a significant date discrepancy, however: while current official records use April 1, 1975, later discussions of contemporary newspaper coverage and a preserved 1978 archival record refer to events extending to approximately April 17, 1975.

Who Was Douglas “Kim” Armstrong?

Douglas Kimberly Armstrong was born October 24, 1955. At the time of his disappearance, he was described as a white male approximately 5 feet 11 inches tall and 160 pounds, with brown hair and blue eyes. He wore black plastic-framed eyeglasses and may have had a mustache, beard or goatee.

Published descriptions say Armstrong was wearing a long-sleeved lavender, blue and white striped shirt, a three-quarter-length brown corduroy coat, blue jeans and size 9 shoes. Dental records or dental X-rays have also historically been reported as available.

Armstrong graduated from Henry M. Gunn High School in Palo Alto in 1973. Historical newspaper information later reproduced by researchers indicates that he spoke German and Spanish and played piano and guitar. Those details come from secondary discussion of period newspaper coverage rather than the current California DOJ listing.

Armstrong’s Disappearance From Palo Alto

The current California missing-person record states that Armstrong has been missing since April 1, 1975. The Charley Project reports that he was living with his parents in Palo Alto and walked away from their home in the 4300 block of Miranda Avenue. He did not return and has not been confirmed seen or heard from since.

His family reportedly considered the disappearance extremely unusual because Armstrong normally remained in contact with relatives. No publicly confirmed explanation has established whether he intended to leave temporarily, deliberately began a new life, encountered an accident, or became the victim of a crime.

The April 1 Versus April 17 Date Discrepancy

One of the most important unresolved issues in Armstrong’s case is the apparent conflict surrounding the date he actually disappeared.

California DOJ, NamUs and the principal modern missing-person databases identify April 1, 1975 as his missing date or date of last contact. Those are the dates that should be treated as the current official record.

However, researchers discussing contemporary 1975 newspaper reports have presented a more complicated sequence. According to information reproduced on Websleuths from period reporting, Armstrong had returned to California and later withdrew $133 from a bank account containing $136 on April 17, 1975. That account describes April 17 as associated with his disappearance. Separately, a Dutch archival inventory concerning a later inquiry into Armstrong’s disappearance identifies him as missing from San Francisco on April 17, 1975.

Because these older references conflict with today’s official April 1 date, April 17 should not be presented as a confirmed replacement for the official date. Instead, it represents an unresolved historical discrepancy that could be important when reconstructing Armstrong’s final known movements.

College, California and Reports of a Planned Trip

Armstrong had reportedly attended Haverford College in Pennsylvania for a period before returning to California. Historical newspaper material discussed by case researchers indicates that he experienced difficulties while at college and at one point wanted to return home.

The same historical material says that after returning west, Armstrong spent time in San Francisco. Friends reportedly recalled him saying that he was going away for approximately a week before he vanished. These accounts are potentially significant because they raise the possibility that at least part of his departure was initially voluntary, although there is no evidence establishing what happened afterward.

The Charley Project also notes that some accounts have said Armstrong disappeared while traveling toward school on the East Coast. The differing narratives surrounding Palo Alto, San Francisco and an eastern destination are another indication that the surviving public record is incomplete.

The Reported Mexico Prison Tip

Among the most unusual developments after Armstrong disappeared were reports that he might have been incarcerated in Mexico under an assumed name.

The Charley Project states that such tips were received after his disappearance, but the story was never verified. No publicly available law-enforcement record located in the current review confirms that Armstrong was ever found in a Mexican prison, lived in Mexico under another identity or was conclusively traced outside the United States.

Because the Mexico information remains unverified, it should be considered a historical lead rather than evidence establishing Armstrong’s fate.

Could Armstrong Still Be Compared With Unidentified Remains?

Armstrong’s continued presence in NamUs is significant because the national system is designed to help law enforcement and medical examiners compare long-term missing people against unidentified remains. NamUs also provides agencies with forensic services including DNA analysis, forensic odontology, fingerprint examination and forensic anthropology.

Armstrong has periodically been discussed by online missing-person researchers in connection with unidentified individuals. Such comparisons are useful for generating leads, but an online resemblance or proposed match does not establish an identification. Public discussions should therefore be distinguished from exclusions or identifications officially made by investigators.

Latest Publicly Available Investigation Information

As of September 2026, Armstrong continues to appear in the California Department of Justice missing-person database. The state record identifies the Palo Alto Police Department as the investigating agency and continues to display case number 75-3251 and the department’s case contact number.

NamUs also continues to index Armstrong as MP26846, with April 1, 1975 as the date of last contact. The continuing NamUs entry means that Armstrong remains represented in the national system used to support comparisons and missing-person investigations.

No publicly documented announcement located in the current review indicates that Armstrong has been found, identified among unidentified remains, declared the victim of a confirmed homicide, or that an arrest has been made in connection with his disappearance. Likewise, there is no publicly confirmed resolution of the reported Mexico lead.

That absence of a public announcement does not mean investigative work or comparisons are not occurring behind the scenes. Law-enforcement agencies and NamUs do not necessarily publish every comparison, exclusion, forensic review or investigative action while a case remains open.

Why the Douglas Kimberly Armstrong Case Still Matters

Armstrong disappeared at only 19 years old and would now be in his seventies. His case illustrates one of the difficulties surrounding disappearances from the 1970s: early newspaper reports, family recollections and later computerized missing-person records do not always contain identical dates or circumstances.

The difference between an official April 1 disappearance and historical references to activity on April 17 is especially important. If the reported April 17 banking activity can be verified through original records, it could substantially change the known window in which Armstrong disappeared. At present, however, the official public record continues to use April 1, 1975.

Anyone with firsthand information about Douglas “Kim” Armstrong’s movements in Palo Alto, San Francisco, Pennsylvania or elsewhere during the spring of 1975—or information concerning the later Mexico reports—should provide that information directly to law enforcement rather than attempting to investigate or confront anyone independently.