Alexander Mitchell Riffenburg

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Top Row and Bottom Left and Center: Alexander, circa 2009;
Bottom Right: Age-progression to age 7 (circa 2014)

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Vital Statistics at Time of Disappearance

  • Missing Since: January 9, 2009 from Palmdale, California
  • Classification: Endangered Missing
  • Date of Birth: September 29, 2007
  • Age: 1 year old
  • Height and Weight: 3'0, 40 pounds
  • Distinguishing Characteristics: Caucasian male. Sandy blond hair, blue eyes.
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    Details of Disappearance

    Alexander was last seen with his father, Thomas Riffenburg, and his mother, Jennifer Walsh, in Palmdale, California on January 9, 2009. A photo of Thomas is posted below this case summary.

    On November 15, 2010, Thomas was arrested in St. Paul, Oregon. Walsh and Alexander weren't with him at the time. He was subsequently sentenced to a long prison term for seven counts of robbery, and in June 2015, he attacked and killed his cellmate at the Snake River Correctional Institution. He pleaded guilty to aggravated murder and was sentenced to life in prison without the possibility of parole.

    Although they went missing at the same time, authorities believe Walsh and her son may not be together. Their cases remain unsolved.

    Thomas Riffenburg
    Above: Thomas Riffenburg

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    Investigating Agency
    If you have any information concerning this case, please contact:
    Los Angeles Police Department
    877-275-5273

    OR
    213-316-1800

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    Source Information
    California Attorney General's Office
    The National Center For Missing and Exploited Children
    NamUs
    Missing Persons in California
    Facebook Page for Jennifer Walsh and Alexander Riffenburg
    The Argus Observer

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    Updated 3 times since October 12, 2004.

    Last updated January 22, 2017; picture added, details of disappearance updated.

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