Lee (Arden Cho) was a hidden villainess from "My Own Worst Enemy," episode 2.08 of Rizzoli & Isles (airdate August 29, 2011). She was the owner of Lee's Nail Salon, which she ran with her business partner, Ted.
It was later revealed that Lee and Ted were also selling heroin on the side, and they had Chris Dunbar as their employee. Ted murdered Chris' father, Evan, when Evan became suspicious, and Chris himself was left beaten and injured. Both Lee and Ted were encountered by Jane Rizzoli and Vince Korsak regarding their establishment's connection to Evan, with Lee stating that Evan was a frequent customer.
However, Lee's reveal as a villainess came when Evan's brother, Arthur Dunbar, was being tracked by Jane and company. Arthur was spotted entering the salon and was shown handing a case containing $2 million (which Chris withdrew) to Lee, who later shot Arthur. Jane and Korsak entered the salon right after the shooting, and shortly afterwards, the evil Lee pointed her gun at Jane, who shot Lee to death in response. Arthur survived the shooting to reveal that Lee was the only one who knew the whereabouts of Chris' wife and son, who were held captive by Ted and later rescued by Jane and Korsak.