The Hancock County District Attorney says the case against Eric Fletcher, 37, became too difficult to prove and dismissed it.
Fletcher was accused of selling drugs to Brendon Bubar, who died in an Ellsworth motel room in March of last year.
As part of a Washington County drug case, Fletcher was sentenced this week to 30 days in jail.
He pleaded guilty to unlawful possession of scheduled drugs and criminal forfeiture from a case last summer.
Fletcher was also fined $400.