Five defendants have been charged in connection with the death of Perry, according to U.S. Attorney Martin Estrada. Estrada made the announcement during a news conference in Los Angeles on Thursday.

The five arrested include Jasveen Sangha (41), known as the “Ketamine Queen” of North Hollywood, Dr. Salvador Plasencia (42), Eric Fleming (54), Dr. Mark Chavez (54), and Kenneth Iwamasa (59), who was Perry’s live-in assistant and is alleged to have conspired with the others to obtain and distribute ketamine to Perry.

Fleming also pleaded guilty to one count of conspiracy to distribute ketamine and one count of distribution of ketamine resulting in death earlier this month.

The attorney says that the group is part of a “broad underground criminal network,” and supplied ketamine to Perry and others. “These defendants took advantage of Mr. Perry’s addiction issues to enrich themselves. They knew what they were doing was wrong,” Estrada said (via Deadline).