Resident Demon (2004)

Three years ago a string of serial slayings ended when the young woman behind them put herself to death while bathing in the blood of her victims. The woman's sister pleaded with the authorities to take measures against the return of her sister's spirit, claiming that her death had been a part of a ritual to the Devil. The young girl was placed in a mental hospital, their house was repossessed, and her sister was all but forgotten--until now. Their house's new owners unwittingly release the long-dead spirit and it leaps from body to body, possessing, killing, and feeding. As the numbers dwindle, each person can only wonder, are you, you, or you... the LICH?.