Rapid City Man Sentenced to Two Years and Six Months in Federal Prison for Fourth Conviction for Failing to Register as a Sex Offender

RAPID CITY - United States Attorney Alison J. Ramsdell announced today that U.S. District Judge Camela C. Theeler sentenced a Rapid City, South Dakota, man convicted of Failure to Register as a Sex Offender. The sentencing took place on March 31, 2025.

Blaine Kills Back, age 48, was sentenced to two years and six 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.

Kills Back was indicted by a federal grand jury in September 2024. He pleaded guilty on January 22, 2025.

Kills Back is required to register as a sex offender based on two convictions for sexual assault offenses. His first conviction as an adult was for Sexual Abuse of a Minor in February 2000. He was thereafter convicted of Sexual Contact without Consent in the Seventh Judicial Circuit Court, Pennington County, South Dakota, in February 2005, after he groped a woman without her consent at the federal halfway house facility while on supervised release for his prior sex offense conviction. Kills Back was convicted of Failure to Register as a Sex Offender on three prior occasions, in 2015, 2018, and 2023. In July 2024, Kills Back was released from prison and began supervised release in Rapid City. Kills Back reported to the Rapid City Police Department’s Sex Offender Registry Office to register an address, but it was within a prohibited community safety zone in Box Elder, South Dakota. Kills Back never attempted to register a valid address thereafter, despite knowing he was required to do so. His whereabouts were unknown for more than a month.

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 https://www.justice.gov/psc.

The U.S. Marshals Service investigated the case. Assistant U.S. Attorney Heather Knox handled the prosecution.

Kills Back was immediately remanded to the custody of the U.S. Marshals Service.