Two New York men pleaded guilty to possessing and selling the transgender activist fentanyl-laced heroin, which caused her death.
Jevaughn Mark was linked by investigators to the accidental poisoning deaths of Brandon Román and Robert Barletta.
Antonio Venti and Michael Kuilan were charged with distributing drugs that led to the death of transgender activist Cecilia Gentili.
Gerald Rowe and Angel Anderson are facing life in prison for torturing and murdering 23-year-old George Randall-Saldivar.
Roman Todd, a gay adult film star, has claimed he overdosed in an airport bathroom earlier this month after taking pills laced with fentanyl.