A Central Islip man has been sentenced to 18 years in state prison for selling narcotics that led to the fatal overdose of a 25-year-old Brentwood resident, Suffolk County officials announced.
Raymond A. Tierney said Jeffrey Sloan, 62, pleaded guilty in October to multiple felony charges following an investigation into the February 2025 overdose death. Sloan was sentenced on January 21, 2026, to 18 years in prison followed by five years of post-release supervision.
According to court documents and Sloan’s statements during his guilty plea, Suffolk County Police responded to a Brentwood residence on February 6, 2025, where the victim was found deceased from a drug overdose. At the scene, investigators recovered nine glassine envelopes containing residue from a mixture of heroin, fentanyl, cocaine, and ketamine, as well as a pill containing Xanax and the victim’s cellphone.
A review of the cellphone revealed text messages between the victim and Sloan arranging the purchase of 13 bags of heroin and one Xanax pill for $140. The two men agreed to meet on February 4, 2025, at a 7-Eleven convenience store on Crooked Hill Road in Brentwood.
Surveillance footage obtained by investigators showed the victim withdrawing cash from an ATM before Sloan arrived. The video allegedly captured what appeared to be a hand-to-hand narcotics transaction between the two men.
An autopsy conducted by the Suffolk County Medical Examiner detected fentanyl, cocaine, ketamine, morphine, and fentanyl analogues in the victim’s system. The cause of death was ruled a mixed drug intoxication.
On February 19, 2025, police executed a court-authorized search warrant at Sloan’s residence, camper, and three vehicles. Investigators allegedly recovered more than 16 ounces of a fentanyl-heroin mixture, cocaine, more than 100 pills including Xanax and oxycodone, multiple cellphones, a ledger documenting narcotics transactions, and various drug paraphernalia. Additional substances recovered included mixtures containing heroin, fentanyl, cocaine, ketamine, and medetomidine.
Medetomidine, a powerful veterinary tranquilizer reportedly about 100 times stronger than xylazine, is legally possessed in New York State but has increasingly appeared as an adulterant in the illicit drug supply, according to authorities.
On October 22, 2025, Sloan pleaded guilty before Acting Supreme Court Justice Richard I. Horowitz to Criminal Possession of a Controlled Substance in the First Degree, a Class A-1 felony, and Criminal Sale of a Controlled Substance in the Third Degree, a Class B felony.
“This sentence sends a clear message that this community will not tolerate those who choose profit over human life,” Tierney said.
Sloan was represented by Adeline Arvelo, Esq. The case was prosecuted by Assistant District Attorney Dana Gremaux of the Narcotics Bureau and investigated by members of the Suffolk County Narcotics Section.
A criminal conviction reflects the findings of the court.
