SIOUX FALLS, S.D. (KSFY) - UPDATE: Authorities have arrested a man they say sold fentanyl that resulted in an overdose in Sioux Falls.
Fifty-seven-year-old Michael Wayne Cooper was arrested Monday in Sioux Falls, according to the U.S. Marshals Service.
Cooper was arrested by the Sioux Falls Drug Task Force at an apartment in the southwest part of the city.
Federal authorities are asking for the pubic's help in locating a man wanted for allegedly selling fentanyl that resulted in an overdose in Sioux Falls.
Fifty-seven-year-old Michael Wayne Cooper was indicted earlier this month, according to U.S. Attorney Ron Parsons.
Investigators say Cooper is still at large and is actively sought by federal authorities. He was last known to reside in Sioux Falls but has strong ties to the Chicago area, as well as Louisiana.
Anyone with information about Cooper’s whereabouts can contact the U.S. Marshal Service at (605) 330-4356 or by email at
Authorities announced Cooper's indictment, along with 18 others, on Monday. These cases were part of a massive state-wide push to fight the opioid epidemic.