SIOUX FALLS, S.D. — A 33-year-old Sioux Falls woman has been sentenced to 20 years in federal prison for distributing fentanyl that caused another woman’s death. Anastasia Muggins was convicted of distribution of a controlled substance resulting in death.
According to federal authorities, on Dec. 15, 2024, Sheila Eastman was found dead at her Sioux Falls residence. Eastman, who was born in Flandreau, was an enrolled member of the Flandreau Santee Sioux Tribe. The coroner determined she died from fentanyl toxicity.
Investigators with the Sioux Falls Police Department determined Muggins had distributed approximately 0.1 grams of fentanyl powder to Eastman. Authorities say Eastman ingested the drug and died.
According to an online obituary, Eastman left behind four children.
“As this case tragically shows, illicit fentanyl is much closer to a chemical weapon than a simple narcotic. Just two milligrams, an almost undetectable trace amount equivalent to 10 to 15 grains of table salt, is a lethal dose,” said U.S. Attorney Ron Parsons. “Hundreds of thousands of Americans like Sheila have been killed by the fentanyl smuggled into this country from China and the Mexican drug cartels. We are committed to doing everything we can to put an end to the death and misery these chemical weapons continue to cause.”
Muggins was indicted by a federal grand jury in May 2025 and pleaded guilty in December 2025.
The case was investigated by the Sioux Falls Police Department and the Drug Enforcement Administration.
