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A documentary series examining whether psychopathic behavior is genetic.
Season 4, Episode 9
The investigation into the 1985 murders of an elderly Ethel, Wash., husband and wife hones in on suspects, but stalls for decades due to a lack of evidence.
Season 4, Episode 8
A Michigan family places an over-emphasis on winning.
Season 4, Episode 7
A sibling rivalry spins out of control and leads to death.
Season 4, Episode 6
Greed, jealousy and a thirst for power rip a family apart and spur a double murder.
Season 4, Episode 5
A Korean family starting a new life in America is thrown into disarray when tradition turns to rebellion.
Season 4, Episode 4
A once-supportive family is torn asunder by greed.
Season 4, Episode 3
A small-town cashier's life turns into a nightmare when her stepmother and stepbrothers move in.
Season 4, Episode 2
A bitter rivalry between two sisters spirals out of control and spreads to the next generation.
Season 4, Episode 1
The dream life of an optometrist and his family turns into a nightmare.
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