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After the DeFeo family was discovered murdered in their beds, Ronald DeFeo Junior, the family's only surviving member, was placed under police protection. Investigators initially believed a mob hit man had committed the crime, but DeFeo soon confessed and was convicted of murdering his parents and four siblings. A number of controversies surround the case, especially regarding the possible involvement of DeFeo's sister Dawn. What best-selling novel and series of films did these events inspire?