A Westbury man pleaded guilty to selling deadly narcotics, including fentanyl, and possessing explosive materials in his home, Nassau County District Attorney Anne Donnelly announced.

Anthony Gianatiempo pleaded guilty on Tuesday, June 2, to criminal sale of a controlled substance and attempted criminal possession of a weapon, and is expected to besentenced to six years in prison and five years post-release supervision on Aug. 7, Donnelly said.

On June 18, 2025, Gianatiempo left his home on Cantiague Lane in Westbury on an electric bicycle and went to Cantiague Park to allegedly sell various narcotics to a person in the park, the DA said.

In exchange for $820, he allegedly sold a package containing a small clear plastic bag of a green powdery substance, later confirmed to contain heroin, cocaine, and other cutting agents; one clear plastic bag containing a white and gray powdery substance determined to be fentanyl, ketamine, and heroin; one clear plastic bag containing a white powdery substance, later confirmed to be cocaine; and several white tablets containing alprazolam, the DA said.

A very dangerous veterinary tranquilizer, xylazine, also known as “tranq,” was also present in the white and gray powdery substance that tested positive for fentanyl, Donnelly said.

Based on the investigation, a search warrant was executed at the defendant’s residence on Aug. 5, by the Nassau County District Attorney’s office, the Nassau County Police Department, and the DEA, which recovered 63 grams of heroin, 39 grams of fentanyl, 69 grams of methamphetamine, cocaine, ketamine, brown cardboard tubes with fuses wrapped in blue and black tape and a bottle wrapped in black electrical tape with a fuse found in Gianatiempo’s basement bedroom, smokeless powder attached to the defendant’s bedroom door and counterfeit money, according to the DA.

The narcotics were found throughout the basement, in Gianatiempo’s room, and in the workstation area outside of his bedroom door in the basement, she said.

During the execution of the search warrant, investigators also recovered a compound of nitazene, a dangerously potent synthetic opioid, that had not been previously identified in any substances by law enforcement in Nassau County and is currently not illegal to possess in the state, Donnelly said.

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Source: LI Press