A popular high school teacher is killed in a hit and run that is clearly no accident. The squad works to solve the case, but Jane is preoccupied with Lt. Martinez's apparent favoritism towards his own drug unit.
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David Sutton, a high school driver's education/science teacher, is killed by a hit-and-run driver. The car used is from his own class. A fiber from what is believed to be from a friendship bracelet is found inside. When Samantha Cole, Sutton's chemistry student, attempts a drug overdose before his death, her background is checked. The team learns she had a tightly knit circle of friends and that Sutton was exchanging grades for sex. Sutton also tried to ruin Cole's reputation before she could report him. One of her friends had tried to entrap him but was discovered and fled. Sutton pursued them and was hit. Each friend confessed to it and no evidence could single out a viable suspect, so all are set free. Meanwhile, although Jane remains in contact with Casey, she gets asked out on a date by Detective Martinez. Maura calls it "chemistry", but Jane says it can never happen.
- Angie Harmon as Detective Jane Rizzoli
- Sasha Alexander as Dr. Maura Isles
- Jordan Bridges as Officer Frankie Rizzoli, Jr.
- Lee Thompson Young as Detective Barry Frost
- Bruce McGill as Detective Vince Korsak
- Lorraine Bracco as Angela Rizzoli
- Brian Goodman as Sean Cavanaugh
- Amaury Nolasco as Rafael Martinez
- Chris Vance as Casey Jones
- Chris Tallman as David Sutton
- Sammi Hanratty as Chloe
- Leah Bateman as Emma
- Piper Curda as Megan
- Vanessa Bell Calloway as Assistant District Attorney
- Tricia Leigh Fisher as Mrs. Cole
- Tina Huang as Susie Chang
- Andrea Bordeaux as Neda
- Kevin Rock as Principal Roger Appleton
- Meryl Hathaway as Mrs. Sutton
- Alexis Raich as Samantha Cole
- Christopher May as Mr. Cole
- Dyana Liu as Karine Alberts
- Paxton the Dog as Jo Friday
- M. J. Dougherty as Woman Rater