Delbert Lapsley, 48, of Detroit , pleaded guilty to distribution of oxymorphone, also known as Opana.
Lapsley admitted that on Aug. 2, 2011, he illegally sold Opana at or near Charleston .
Lapsley faces up to 20 years in prison and a $1 million fine when he is sentenced June 12 by U.S. District Judge John T. Copenhaver Jr.