Eric Beckley of Centreville, a dealer from the crew that supplied heroin to former judge Michael Cook, will serve 11 years and three months in prison.
U.S. District Judge David Herndon set his sentence on May 8, at the low end of a guideline range from 135 months to 14 years.
Herndon, who could have fined Beckley up to $1 million, fined him $500.
Beckley pleaded guilty in October to charges of possessing heroin with intent to distribute it and possessing a firearm as a felon.
His plea agreement calculated a guideline range of 168 to 210 months, but Herndon calculated a lower range.
Beckley admitted he sold drugs for Deborah Perkins, of Fairview Heights.
Perkins also distributed drugs through her son, Douglas Oliver, and through Sean McGilvery of Belleville, who provided heroin to Cook.
Perkins, Oliver, and McGilvery pleaded guilty of distribution last year, and Cook pleaded guilty of possessing heroin and using it while possessing firearms.
Oliver will serve 30 years, Perkins 27, McGilvery 10, and Cook two.