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William Cierzan Missing Person Case

Last seen in Santa Clarita, California on Jan 26, 2017

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Victim Details

Apr 21, 2017

Dec 17, 2021

William

Cierzan

67

58

68 inches

190 lbs

White / Caucasian

Male

Jan 26, 2017

Santa Clarita

California

Los Angeles County

91355

33470

Los Angeles County Sheriff's Department-Monterey Park - Homicide Bureau

Monterey Park

California

Los Angeles County

91755

Tamar Abraham

Detective

1 Cupania Circle, California

3238905500

County

Law Enforcement

http://www.lasd.org/about_us.html

017-01240-0642-400

Jan 27, 2017

Los Angeles County Sheriff's Department-Monterey Park - Homicide Bureau

Gray or Partially Gray

Brown

Brown

Oct 14, 2026


Area Last Seen:

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William Cierzan still missing 2 years after disappearance

Case Description

Any updates on this case? Let us know!
Summary based on the NamUs case record (MP37954) and 9 other sources
William Cierzan, 58, was last seen on January 26, 2017, at his home in Santa Clarita, California. He was spending the day with his nephew, Daniel Cierzan, watching television. After a trip to a nearby convenience store, William spoke to his wife between 3:30 and 4:00 p.m. about their evening plans. When she returned home around 7:00 p.m., she found the house in disarray. A prepared dinner was left out, but William was gone. His car, wallet, and phone were still at the house, and unsettlingly, traces of his blood were found both inside and outside the home.

Surveillance footage from a neighbor’s camera showed a vehicle, resembling Daniel’s, pulling into William’s driveway around 5:00 p.m. and leaving shortly thereafter. Despite being a person of interest early in the investigation, Daniel initially denied knowing what happened to his uncle. In 2020, Daniel was arrested and charged with his uncle's murder. He later admitted to dumping William's body in a remote location after a confrontation. However, William’s remains have never been found.

In 2022, Daniel Cierzan was sentenced to 11 years in prison for voluntary manslaughter as part of a plea deal. The case remains unresolved in terms of the recovery of William’s body, leaving his family still seeking answers.
Last Seen: Jan 26, 2017

Links to Additional Sources (9)

See any mistakes? Let us know!
  • Saugus Man Pleads Guilty To Voluntary Manslaughter, Sentenced ...">Saugus Man Pleads Guilty To Voluntary Manslaughter, Sentenced ...
  • Nephew arrested in murder of Valencia man missing since 2017
  • Cierzan family to honor missing man's birthday as they await murder ...
  • Man Sentenced to 11 Years for Killing His Uncle | KFI AM 640 - iHeart
  • William John Cierzan | State of California - Department of Justice
  • Man charged with killing his uncle, who disappeared from Santa ...
  • Man charged with murdering uncle who disappeared in 2017
  • Missing: William Cierzan
  • Missing Person / NamUs #MP37954

    • Possible Unidentified Matches (10)

    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.

    84%Moderate
    John Doe — Los Angeles, California - unidentified case UP55211
    John Doe — Los Angeles, California
    UP55211 • Found Jan 16, 2019
    View case
    Sex ✓Male
    Age 100%Est. 50–65 vs 58 when missing
    Race 100%White
    Location 94%31 mi away, same county
    TimingFound 24 months after last seen
    Height 100%5'8" vs 5'8"
    Weight 100%198 lb vs 190 lb
    Hair 40%Brown vs Gray
    Eyes 100%Brown vs Brown
    82%Moderate
    John Doe — Los Angeles, California - unidentified case UP77704
    John Doe — Los Angeles, California
    UP77704 • Found Dec 31, 2020
    View case
    Sex ✓Male
    Age 85%Est. 50–70 vs 58 when missing
    Race 100%White
    Location 94%33 mi away, same county
    TimingFound 4 years after last seen
    Height 100%5'3"–5'8" vs 5'8"
    Weight 88%140–160 lb vs 190 lb
    Hair 100%Gray vs Gray
    Eyes 100%Brown vs Brown
    82%Moderate
    John Doe — Los Angeles, California - unidentified case UP17010
    John Doe — Los Angeles, California
    UP17010 • Found Jul 28, 2017
    View case
    Sex ✓Male
    Age 100%Est. 50–65 vs 58
    Race 100%White
    Location 95%28 mi away, same county
    TimingFound 6 months after last seen
    Height 100%5'7" vs 5'8"
    Weight 100%182 lb vs 190 lb
    Hair 40%Brown vs Gray
    Eyes 0%Blue vs Brown
    80%Moderate
    John Doe — Los Angeles, California - unidentified case UP60986
    John Doe — Los Angeles, California
    UP60986 • Found Sep 22, 2019
    View case
    Sex ✓Male
    Age 100%Est. 45–60 vs 58 when missing
    Race 60%Hispanic
    Location 94%34 mi away, same county
    TimingFound 3 years after last seen
    Height 100%5'5"–5'9" vs 5'8"
    Weight 82%154 lb vs 190 lb
    Hair 100%Gray vs Gray
    Eyes 100%Brown vs Brown
    79%Possible
    John Doe — Los Angeles, California
    UP104480 • Found Mar 22, 2023
    View case
    Sex ✓Male
    Age 100%Est. 55–70 vs 58 when missing
    Race 100%White
    Location 94%33 mi away, same county
    TimingFound 6 years after last seen
    Height 100%5'6"–5'9" vs 5'8"
    Weight 100%180–190 lb vs 190 lb
    Hair 40%Brown vs Gray
    Eyes 0%Blue vs Brown
    79%Possible
    John Doe — Los Angeles, California - unidentified case UP78168
    John Doe — Los Angeles, California
    UP78168 • Found Mar 19, 2020
    View case
    Sex ✓Male
    Age 85%Est. 45–65 vs 58 when missing
    Race 100%White
    Location 94%32 mi away, same county
    TimingFound 3 years after last seen
    Height 100%5'5"–5'10" vs 5'8"
    Weight 88%140–160 lb vs 190 lb
    Hair 100%Gray vs Gray
    Eyes 0%Blue vs Brown
    77%Possible
    John Doe — Los Angeles, California - unidentified case UP101827
    John Doe — Los Angeles, California
    UP101827 • Found Feb 10, 2023
    View case
    Sex ✓Male
    Age 100%Est. 60–70 vs 58 when missing
    Race 60%Hispanic
    Location 92%40 mi away, same county
    TimingFound 6 years after last seen
    Height 84%5'4"–5'6" vs 5'8"
    Weight 88%140–160 lb vs 190 lb
    Hair 100%Gray vs Gray
    Eyes 100%Brown vs Brown
    77%Possible
    John Doe — Menifee, California
    UP100667 • Found Sep 9, 2021
    View case
    Sex ✓Male
    Age 100%Est. 58–72 vs 58 when missing
    Race 100%White
    Location 76%95 mi away, same state
    TimingFound 5 years after last seen
    Height 100%5'9" vs 5'8"
    Weight 79%151 lb vs 190 lb
    Hair 100%Gray vs Gray
    Eyes 0%Blue vs Brown
    77%Possible
    John Doe — Los Angeles, California - unidentified case UP17844
    John Doe — Los Angeles, California
    UP17844 • Found Apr 20, 2018
    View case
    Sex ✓Male
    Age 85%Est. 40–60 vs 58 when missing
    Race 60%Hispanic
    Location 94%33 mi away, same county
    TimingFound 15 months after last seen
    Height 100%5'5"–5'8" vs 5'8"
    Weight 99%160–170 lb vs 190 lb
    Hair 40%Brown vs Gray
    Eyes 100%Brown vs Brown
    77%Possible
    John Doe — Los Angeles, California
    UP79504 • Found Mar 10, 2017
    View case
    Sex ✓Male
    Age 60%Est. 29–75 vs 58
    Race 100%White
    Location 93%34 mi away, same county
    TimingFound 6 weeks after last seen
    Height 100%5'6"–5'10" vs 5'8"
    Hair 100%Gray vs Gray

    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)

    William Cierzan, 58, was last seen at his Santa Clarita home on January 26, 2017. That afternoon he... ...Read More
    08/15/2024

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