Matlock (1986) : 3x18

When William Austin comes to Atlanta from Chicago and heads to the cult that has ensnared his son Dennis, Dennis tells him to leave him alone, the cult is his home now, and that he is no longer his father. The leader of the cult, Joshua Bradbury, tells Austin that he needs to accept Dennis' decision, and to leave him alone. Austin refuses to leave without his son, and Bradbury has the police escort Austin (who threatens to take off Bradbury's head) out of mansion. Dennis observes someone shooting Joshua, then tells police he sees his father fleeing the scene of the crime. William Austin heads to Ben Matlock for help in defending himself. After learning that Dennis has signed his trust fund and his life's savings over to the cult, Matlock confronts him, and is shocked to hear Dennis deny his father. Matlock goes to a reknowned expert in de-programming cult victims, who tells him that Dennis may believe he saw his father, but he is probably so brain-washed by the cult that he can't real