The fatal overdose happened Monday in Rockville Centre.
Floral Park resident David Gugel, 36, was charged with third-degree criminal sale of a controlled substance and third-degree criminal possession of a controlled substance.
Police said 25-year-old Michael Thomas, of Elmont, was also charged with two counts of third-degree criminal possession of a controlled substance and nine counts of third-degree criminal sale of a controlled substance.
Both defendants were arraigned Wednesday at First District Court in Hempstead.
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