A woman known as the “Ketamine Queen,” charged with selling Matthew Perry the drug that killed him, agreed to plead guilty Monday. Jasveen Sangha becomes the fifth and final defendant charged in the overdose death of the “Friends” star to strike a plea agreement with federal prosecutors, avoiding a trial that had been planned for September. In a brief statement, Sangha's lawyer Mark Geragos said only, “She's taking responsibility for her actions.”