1.   The identity of the psychotic murderer known as the Zodiac Killer remains an intriguing puzzle.

2.   Psychotic murderers.

3.   The first involves a psychotic murderer consumed with hubris.

4.   The deed of a psychotic murderer?

5.   In the movie, the spirit of a psychotic murderer possesses the doll, which comes to life and stabs several people to death.