S4, E2: While investigating the homicide of an overzealous journalism student, Jane is not happy when a former colleague (recurring guest star AMAURY NOLASCO – Prison Break) returns to the Boston Police Department as the new lieutenant of the drug unit. But the murder Jane is investigating soon forces her to deal with him — and the event in the past that wrecked their relationship. Meanwhile, an alarming tip from Cailin (recurring guest star EMILEE WALLACE) causes Maura to investigate Hope (recurring guest star SHARON LAWRENCE).