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The death of Robert De Niro 's 19-year-old grandson Leandro Anthony De Niro-Rodriguez is allegedly linked to a criminal network that targeted teens and adults living in New York City ... this according to federal prosecutors.

Five alleged drug suppliers arrested in the case -- Bruce "Tea" Epperson , Eddie Barreto , Grant "Dizzy" McIver , John "John John" Nicolas and Roy Nicolas -- were purportedly wrapped up in a drug distribution ring that also involved 2 other unnamed drug dealers who helped distribute their supplies. One of the unnamed dealers allegedly sold Leandro the lethal batch of drugs that took his life. Instagram/@drenadeniro

The unnamed dealer allegedly DM'd back and forth with someone the documents refer to as

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