Kathleen "Kathy" Lutz, played by Margot Kidder, is a character in the 1979 film The Amityville Horror.
Kathy, newly married to George Lutz, and their children, move into 112 Ocean Avenue. Almost immediately strange things begin to happen. Kathy is visited by a neighbor who seemingly vanishes in the blink of an eye. She receives strange phone calls, and Father Delaney and her Aunt Helena, a nun, both had to hurriedly leave the house, overcome with illness.
Meanwhile George is obsessed with warming the house and is becoming increasingly irritable. Her daughter, Amy is talking to an imaginary friend she's named "Jody".
Within 28 days events have escalated to the point where the house is not only unlivable, but dangerous. She and the rest of the family are forced to vacate the house, leaving everything behind.