Plot summary
David Sutton ( Chris Tallman ), 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 (Alexis Raich), 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.
Credits
Adapted from Wikipedia contributors, List of Rizzoli & Isles episodes. HTML formatting and reference markers removed.