Anne Wiswell, 25, was found dead in the park reportedly surrounded by beer cans and pills.
Patrick Morgan, 23, allegedly sold the drug to Jeffrey Russ before the 2013 festival.
Organizers of the event where two people overdosed last summer also have stringent new safety rules.
The three-day music festival came under fire after the deaths of two concertgoers in 2013.
Heroin found in an accused dealer's apartment did not match the heroin found with Hoffman, sources said.
Robert Vineberg, 57, was indicted for possession of 250 bags of heroin.
David Bar Katz is suing for defamation over a tabloid story that claimed he and Hoffman were lovers.
Mike Bindra once ran club Twilo, which allegedly had a secret room to warehouse OD-ing patrons.
Shaniesha Forbes, 14, was found naked and burned, but cops still don't know how she died.
Jesus Soto is believed to have killed his wife, Yanet Soto, before killing himself on Arden Street.
Gigi Jordan's attorney Ronald Kuby blasted the DA for losing a key piece of evidence in her murder case.
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