Archie Mack, Failure to Register as a Sex Offender, South Dakota 2025

Pierre Man Sentenced for Failure to Register as a Sex Offender

PIERRE – A Pierre man was sentenced to three months in federal prison for failing to register as a sex offender, announced United States Attorney Alison J. Ramsdell.

Archie Mack, age 41, was sentenced to three months in federal prison, followed by five years of supervised release, and ordered to pay a $100 special assessment to the Federal Crime Victims Fund.

Mack was convicted of Sexual Abuse of a Minor in December 2005. As a result of this conviction, he is required to register as a sex offender and update his registration within three business days of relocation or change in employment or student status.

In August 2024, Mack updated his sex offender registration to reflect that he was residing at a residence in Pierre. However, in September 2024, Mack relocated to a different residence in Pierre, but did not update his sex offender registration. On November 19, 2024, Mack was arrested in Pierre.

This case was brought as a part of Project Safe Childhood, a nationwide initiative to combat the growing epidemic of child sexual exploitation and abuse, launched in May 2006 by the government.

This case was investigated by the U.S. Marshal’s Service and the Pierre Police Department. Assistant U.S. Attorney Kirk Albertson prosecuted the case. Mack was immediately remanded to the custody of the U.S. Marshals Service.

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