The son of the Lutz's spoke out in 2005, he says that there are 3 stories about what happened in that house in Amityville. But all of them are fake. That his step-father went around trying to contact spirits in the house by chanting things, and instigating things.

There were paranormal occurrences, but things that his dad brought upon himself. Nothing that was in the film, tho. That was all lies.

Kathy and her estranged husband are both dead now, hopefully not being tormented by the spirits that they stirred up. God forgive them for their stupid.