Poltergeist: The Legacy (1996)

S1E15 The Thirteenth Generation

During the 17th Century a suspected witch is 'tested' by being dunked in water, as she goes to her death she curses the next thirteen generations of the Witchfinders family. While guest lecturing at a Boston University Derek gets involved in a series of murders/deaths that seem to involve the same family and could be connected to the long rumoured curse.