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Press Release

South Dakota Man Sentenced to Federal Prison for Failure to Register as a Sex Offender

For Immediate Release
U.S. Attorney's Office, District of South Dakota

SIOUX FALLS - United States Attorney Alison J. Ramsdell announced today that U.S. District Judge Charles B. Kornmann has sentenced a South Dakota man convicted of Failure to Register as a Sex Offender. The sentencing took place on November 20, 2023, in Aberdeen, South Dakota.

Marcus Lance Dumarce, age 54, was sentenced to 20 months in federal prison, followed by five  years of supervised release. He was also ordered to pay $100 as a statutorily required special assessment to the Federal Crime Victims Fund.

Dumarce was indicted for Failure to Register as a Sex Offender by a federal grand jury in February of 2023. He pleaded guilty on August 28, 2023.

According to court documents, Dumarce was convicted in federal court of Abusive Sexual Contact of a Minor in April of 2003. Between December 20, 2018, and June 15, 2023, Dumarce left the residence at which he had been registered in Roberts County, South Dakota, and knowingly failed to register as a sex offender. He is required to register for life due to the previous conviction. 

This case was brought as 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 Department of Justice. Led by the U.S. Attorneys’ Offices and the DOJ’s Child Exploitation and Obscenity Section, Project Safe Childhood marshals federal, state, and local resources to locate, apprehend, and prosecute individuals who exploit children, as well as identify and rescue victims. For more information about Project Safe Childhood, please visit

This case was investigated by the U.S. Marshals Service. Assistant U.S. Attorney Jeremy R. Jehangiri prosecuted the case.

Dumarce was remanded to the custody of the U.S. Marshals Service to continue serving his sentence.

Updated November 26, 2023

Project Safe Childhood