Robert J. "Bob" Troester U.S. Attorney | U.S. Attorney for the Western District of Oklahoma
Joseph Preston Anderson, Tiffani Amber Stevens, and Kalub Lynn Robinson have been sentenced in federal court for their involvement in distributing fentanyl that resulted in a fatal overdose. The announcement was made by U.S. Attorney Robert J. Troester.
Court records show that Anderson and Stevens began conspiring to distribute fentanyl as early as September 2023. On December 3, 2023, they provided fentanyl powder to Robinson, who then distributed it to another individual the next day. The recipient died from an overdose after using the drug. Despite being aware of the death, Anderson and Stevens continued selling fentanyl through January 2024.
Anderson and Stevens were charged with drug conspiracy in May 2025 and later pleaded guilty. Robinson was charged on October 22, 2024, with distribution of fentanyl and also pleaded guilty.
At sentencing hearings held on September 15, 2025, U.S. District Judge David L. Russell imposed prison terms of 180 months for Anderson, 72 months for Stevens, and 60 months for Robinson. Each defendant will also serve three years of supervised release following their imprisonment. In addition to prison time, each was ordered to pay $2,725.60 in restitution; collectively totaling $8,176.80.
Judge Russell commented during sentencing: “the circumstances were ‘tragic beyond belief’” and said “the world must know that there are significant consequences for dealing fentanyl.”
The Drug Enforcement Administration (DEA) led the investigation into this case as part of its ongoing efforts against illegal opioid distribution through initiatives such as the “One Pill Can Kill” campaign (https://www.dea.gov/onepill). More information about the dangers associated with fentanyl can be found at https://www.youtube.com/watch?v=96JQ56kuJQI.
Assistant U.S. Attorney Elizabeth Joynes and Special Assistant U.S. Attorney Kaleigh Blackwell prosecuted the case.
Additional details are available in public filings.
