The historical figure who murdered his family in 1974. His spirit, along with the legacy of Reverend Ketcham's evil, remains bound to the house, acting as a primary source of malevolent energy that corrupts George Lutz.
Kathy must survive the direct consequences of Ronald Defeo's historical violence.
Lisa inherits the traumatic environment of the Defeo household, experiencing the same supernatural forces.
The priest's inability to bless the house highlights the overwhelming spiritual corruption left by Defeo.
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