The Exorcist III

When a mysterious entity possesses a young girl, her mother seeks the help of two Catholic priests to save her life.

On the day of his scheduled execution, a convicted serial killer gets a psychiatric evaluation during which he claims he is a demon, and further claims that before their time is over, the psychiatrist will commit three murders of his own.

Ebony Jackson, a struggling single mother fighting her personal demons, moves her family into a new home for a fresh start. But when strange occurrences inside the home raise the suspicions of Child Protective Services and threaten to tear the family apart, Ebony soon finds herself locked in a battle for her life and the souls of her children.

Homicide detective John Hobbes witnesses the execution of serial killer Edgar Reese. Soon after the execution the killings start again, and they are very similar to Reese's style.