A woman dubbed the “Ketamine Queen” has pleaded guilty to selling Matthew Perry the ketamine that killed him. Jasveen Sangha became the fifth and final defendant charged in the overdose death of the “Friends” star to plead guilty Wednesday after an agreement with federal prosecutors. The plea means the 42-year-old will avoid a trial that had been planned for later this month. Prosecutors cast Sangha as a prolific drug dealer who sought to sell especially to celebrities and other wealthy customers. According to court documents, she sold Perry 25 vials of ketamine four days before his death from an overdose of the drug.