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Jason Theis Missing Person Case

Last seen in Calimesa, California on Sep 13, 2012

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Victim Details

Apr 2, 2018

Jan 12, 2024

Jason

Theis

40

26

73 inches

74 inches

270 lbs

275 lbs

White / Caucasian

Male

Sep 13, 2012

Calimesa

California

Riverside County

92320

32158

San Bernardino County Sheriff's Department- Yucaipa Patrol Station

Yucaipa

California

San Bernardino County

92399

Shelby Swanson

Sheriff's Detective

34144 Yucaipa Boulevard, California

9099182305

County

Law Enforcement

https://wp.sbcounty.gov/sheriff/patrol-stations/yucaipa/

141300100

Jan 8, 2013

San Bernardino County Sheriff's Department- Yucaipa Patrol Station

na

Black

Brown

Brown

Oct 16, 2026


Area Last Seen:

Case Description

Any updates on this case? Let us know!
Summary based on the NamUs case record (MP42913) and 3 other sources
Jason Dale Theis, a 26-year-old from Calimesa, California, was last seen on September 13, 2012. Standing 6'2" and weighing approximately 270 pounds, Jason had black hair and brown eyes. Prior to his disappearance, Jason told his family that he was planning to travel to Ireland. However, after September 13, all contact with him ceased, and he has not been heard from since.

Jason's family and law enforcement have had no updates regarding his whereabouts, and there are few details available about the circumstances of his disappearance. The San Bernardino County Sheriff's Department is the lead investigative agency, and Jason remains classified as a missing person. His case is still open, and authorities are seeking any information that might help resolve the mystery of his disappearance.
Last Seen: Sep 13, 2012

Links to Additional Sources (3)

See any mistakes? Let us know!
  • Missing Person / NamUs #MP42913
  • Jason Dale Theis | State of California - Department of Justice
  • Jason Dale Theis - The Charley Project

    • Possible Unidentified Matches (9)

    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.

    79%Possible
    John Doe — Los Angeles, California - unidentified case UP12864
    John Doe — Los Angeles, California
    UP12864 • Found Feb 13, 2014
    View case
    Sex ✓Male
    Age 85%Est. 28–50 vs 26 when missing
    Race 100%White
    Location 84%68 mi away, same state
    TimingFound 17 months after last seen
    Height 100%5'7"–6'0" vs 6'1"–6'2"
    Weight 58%175–190 lb vs 270–275 lb
    Hair 60%Brown vs Black
    Eyes 100%Brown vs Brown
    78%Possible
    John Doe — San Diego, California - unidentified case UP110585
    John Doe — San Diego, California
    UP110585 • Found Oct 14, 2023
    View case
    Sex ✓Male
    Age 100%Est. 30–35 vs 26 when missing
    Race 100%White
    Location 79%85 mi away, same state
    TimingFound 11 years after last seen
    Height 84%5'11" vs 6'1"–6'2"
    Weight 80%215 lb vs 270–275 lb
    Hair 100%Black vs Black
    Eyes 100%Brown vs Brown
    78%Possible
    John Doe — Los Angeles, California - unidentified case UP16874
    John Doe — Los Angeles, California
    UP16874 • Found Jul 20, 2017
    View case
    Sex ✓Male
    Age 100%Est. 30–45 vs 26 when missing
    Race 100%White
    Location 84%68 mi away, same state
    TimingFound 5 years after last seen
    Height 100%5'10"–6'2" vs 6'1"–6'2"
    78%Possible
    John Doe — Pasadena, California
    UP12874 • Found May 22, 2014
    View case
    Sex ✓Male
    Age 88%Est. 18–25 vs 26 when missing
    Race 100%White
    Location 86%63 mi away, same state
    TimingFound 20 months after last seen
    Height 100%5'6"–6'0" vs 6'1"–6'2"
    77%Possible
    John Doe — South Gate, California
    UP10986 • Found Oct 2, 2012
    View case
    Sex ✓Male
    Age 79%Est. 28–38 vs 26
    Race 100%White
    Location 85%66 mi away, same state
    TimingFound 3 weeks after last seen
    Height 100%5'7"–6'1" vs 6'1"–6'2"
    Weight 24%157 lb vs 270–275 lb
    Hair 100%Black vs Black
    76%Possible
    John Doe — Santa Monica, California
    UP104485 • Found Mar 27, 2023
    View case
    Sex ✓Male
    Age 74%Est. 40–55 vs 26 when missing
    Race 100%White
    Location 80%82 mi away, same state
    TimingFound 11 years after last seen
    Height 100%5'10"–6'0" vs 6'1"–6'2"
    Weight 100%255–275 lb vs 270–275 lb
    Hair 100%Black vs Black
    Eyes 100%Brown vs Brown
    76%Possible
    John Doe — Palm Springs, California
    UP60257 • Found Mar 10, 2019
    View case
    Sex ✓Male
    Age 77%Est. 20–24 vs 26 when missing
    Race 100%White
    Location 95%29 mi away, same county
    TimingFound 6 years after last seen
    Height 100%5'9"–6'1" vs 6'1"–6'2"
    75%Possible
    John Doe — Corona, California
    UP68540 • Found Jan 10, 2020
    View case
    Sex ✓Male
    Age 100%Est. 18–32 vs 26 when missing
    Race 100%White
    Location 95%29 mi away, same county
    TimingFound 7 years after last seen
    75%Possible
    John Doe — La Habra, California - unidentified case UP16279
    John Doe — La Habra, California
    UP16279 • Found Oct 18, 2015
    View case
    Sex ✓Male
    Age 100%Est. 27–28 vs 26 when missing
    Race 100%White
    Location 89%51 mi away, same state
    TimingFound 3 years after last seen
    Height 36%5'8" vs 6'1"–6'2"
    Weight 7%141 lb vs 270–275 lb
    Hair 100%Black vs Black
    Eyes 100%Brown vs Brown

    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)

    Jason Dale Theis, 26, of Calimesa, California, was last seen on September 13, 2012. He is described... ...Read More
    07/20/2024

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