8:50 PM PT -- A spokesperson for Lil Peep's family denies Jones having any connection to the rapper.

6:57 PM PT ﻿-- In a joint statement to TMZ from Matt Miller (Wicca Phase Manager), Tom Chiari (Run For Cover Records) and Adam Mcillwee (Wicca Phase Springs Eternal) we're told "Michael Jones is not and has never been a member of Gothboiclique. Any statements to the contrary are 100% false."

Lil Peep's death was not a wake-up call to at least one of his fans, according to cops who arrested the guy for giving a young woman a fatal dose of drugs ... shortly after Peep's funeral.

Law enforcement sources tell TMZ ... the DEA, assisted by NYPD, arrested and charged Michael Jones Wednesday for distributing heroin and fentanyl. We're told the drugs resulted in the death of a woman named Diana Haikova.

Jones, who was part of Peep's group called Goth Boi Clique, was ID'd in a newly unsealed federal indictment.

Law enforcement sources say Jones and many other friends of Peep were in Long Island for his funeral on December 2, 2017. They partied in Manhattan for 3 days to honor their friend and on Dec. 5 we're told Mike met Diana -- who wasn't a member of the crew -- at a hotel party ... then allegedly gave her heroin and fentanyl back at her apartment.

Cops say she was found dead at her place a couple days later, and they believe Jones was the one who supplied the drugs. We're told an indictment against him also claims he distributed heroin a couple months later.