Rachel Hanson (Marie Fink) is the main villainess from "Post Mortem," episode 7.04 of Rizzoli & Isles (airdate June 20, 2016). She is a drug dealer running an operation that includes the distribution of oxy.
Rachel was approached by Derek, a postal worker who developed an addiction to oxy after a car accident. A year prior to the events, Rachel threatened to cut off Derek's supply unless he helped her get packages of oxy through, so he did so, while enlisting fellow worker Jack McCarty to help him, as Jack was financially strapped. At some point, a janitor caught Jack in action, and as a result, Rachel killed the janitor by snapping his neck. Jack himself was attempting to blow the whistle to postal inspector CJ Prescott, leading to Rachel shooting and killing him.
CJ worked with Boston PD on the case, and it was after she and Jane Rizzoli caught Derek that Rachel was revealed as a dealer and murderess. In the episode's climax, Jane went undercover with Frankie and Korsak, with the former of the two setting up a drop that was picked up by Rachel. Once Jane spotted Rachel, a gun battle ensued, with Jane shooting Rachel's left leg. Despite being shot, the villainess made her escape, only to be knocked out by CJ's left hook. After this, Rachel was arrested (off-screen).