Falling: Part 2 - S8.E19

Urged on in his vengeful mission by the death of a schoolgirl from a bad dose of ecstacy, Jack becomes desperate to prove Brad is guilty. Tess can only watch in horror as he oversteps the line. Jack finally wears down a student found dealing, and gets the statement he's been waiting for—one that puts the blame firmly on Brad. But his maverick actions lead Jack to a decision that will change his life forever - he kills Brad and is arrested for murder, to Tess' dismay