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Peter Arnsdorff Missing Person Case

Last seen in Union City, California on Apr 27, 2000

Victim Details

Jun 10, 2015

Apr 13, 2020

Peter

Arnsdorff

45

19

69 inches

180 lbs

White / Caucasian

Male

Apr 27, 2000

Union City

California

Alameda County

94587

16786

Union City Police Department

Union City

California

Alameda County

94587

Nicolas Perry

Detective

34009 Alvarado-Niles Road, California

5104711365

Local

Law Enforcement

https://www.unioncity.org/197/Police

000609-034

Apr 28, 2000

Union City Police Department

Blond/Strawberry

Blue

Blue

Oct 1, 2026


Area Last Seen:

Case Description

Any updates on this case? Let us know!
Summary based on the NamUs case record (MP29028) and 6 other sources
Peter Martin Arnsdorff, a 19-year-old from Union City, California, was last seen on April 27, 2000. That day, he left work early and told his friends that he was heading to Bonny Doon Beach in Santa Cruz. He added that if they didn't hear from him by 7:00 p.m., they should come looking for him at the beach. His friends followed his instructions and went to the beach, where they found his vehicle and a sweatshirt, but there was no other sign of him.

Peter, who stood 5'9" and weighed 180 pounds, had sandy blond hair and blue eyes. Despite an ongoing investigation, no additional clues about his disappearance have been uncovered, and his case remains unsolved. He is classified as an endangered missing person, and authorities continue to search for answers. Anyone with information is urged to contact the Union City Police Department.
Last Seen: Apr 27, 2000

Links to Additional Sources (6)

See any mistakes? Let us know!
  • Peter Martin Arnsdorff - California Department of Justice - CA.gov
  • Private Investigations for the Missing's post - Facebook
  • Missing Person / NamUs #MP29028 | NamUs
  • Peter Martin Arnsdorff - The Charley Project
  • Peter Martin Arnsdorff, Missing, April 2000 CA. - From Whispers to ...
  • 4717DMCA - Peter Martin Arnsdorff - Doe Network

    • Possible Unidentified Matches (3)

    Unidentified remains cases whose details are consistent with this person, ranked by how closely they compare. Fields that are unknown in either case are left out of the score.

    82%Moderate
    John Doe — Sausalito, California - unidentified case UP7083
    John Doe — Sausalito, California
    UP7083 • Found Dec 12, 2006
    View case
    Sex ✓Male
    Age 100%Est. 17–25 vs 19 when missing
    Race 100%White
    Location 95%30 mi away, same state
    TimingFound 7 years after last seen
    Height 100%5'8" vs 5'9"
    Weight 100%170 lb vs 180 lb
    Hair 10%Black vs Blond
    Eyes 100%Blue vs Blue
    80%Moderate
    John Doe — Sausalito, California
    UP7082 • Found Aug 21, 2007
    View case
    Sex ✓Male
    Age 100%Est. 25–35 vs 19 when missing
    Race 100%White
    Location 95%30 mi away, same state
    TimingFound 7 years after last seen
    Height 100%5'10" vs 5'9"
    Weight 98%160 lb vs 180 lb
    Hair 50%Brown vs Blond
    Eyes 30%Hazel vs Blue
    77%Possible
    John Doe — Brisbane, California - unidentified case UP12987
    John Doe — Brisbane, California
    UP12987 • Found Sep 17, 2014
    View case
    Sex ✓Male
    Age 100%Est. 20–35 vs 19 when missing
    Race 100%White
    Location 97%21 mi away, same state
    TimingFound 14 years after last seen
    Height 68%6'0" vs 5'9"
    Weight 100%175 lb vs 180 lb

    These comparisons are generated automatically from public NamUs case data and are not confirmed identifications. Only DNA, dental or fingerprint comparison by investigators can confirm an identity. If you believe two cases are connected, contact the agency handling the unidentified case.

    Unidentified photos are blurred because many are post-mortem. Tap a photo to reveal it.

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    Forum Posts (1)

    I've been really puzzled about how Peter Martin Arnsdorff's friends handled the situation on April... ...Read More
    09/28/2023

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