A 34 year old man from Pierre convicted of Failure to Register as a Sex Offender has been sentenced in federal court.
Sandy Mangelson was sentenced to time served through April 12, 2021, equal to approximately 13 months in custody, and five years of supervised release.
Mangelson was convicted of Sexual Contact With a Child Under Sixteen in November 2005 and Gross Sexual Imposition (with a child) in 2007. As a result of those convictions, he is required to register as a sex offender and to update his registration within three business days of relocation or changing employment. Between December 5, 2019, and December 10, 2019, Mangelson failed to register and update his registration.
Mangelson was immediately turned over to the custody of the US Marshals Service.






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