Howard provided drugs that Kimberly Mullins arranged to be delivered to Green, her daughter, through other inmates on work release, Lisa Lattimore and Lynette Ball, U.S. Attorney Kerry Harvey announced after the sentencing.
Howard provided the mixture of fentanyl and morphine that resulted in Green's fatal overdose on Sept. 5, 2014.
Howard, Mullins, Lattimore and Lynette all pleaded guilty to conspiracy to distribute controlled substances resulting in death.
In addition to giving Howard the 26-year sentence, U.S. District Judge Amul Thapar sentenced Mullins to more than 20 years in prison, Lattimore to more than 13 years in prison and Ball to 12 years in prison. Each will have to serve at least 85 percent of their respective sentences.