The charges against Daniel Ekasala were based on three transactions between the men in May that were secretly recorded by the U.S. Drug Enforcement Administration.
Ekasala pleaded guilty Thursday in federal court. He faces a maximum of nearly five years in prison at sentencing in December.
Kaczur is not named in court records but has been identified as the cooperating witness by Bernard Grossberg, Ekasala's lawyer.
Grossberg says Kaczur went undercover for the federal agency after he was stopped for speeding in New York and was caught with Oxycontin pills.
The drug charges were put on hold if Kaczur stays out of trouble for six months.
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