"The Possession of Joel Delaney" is a 1972 film starring Shirley MacLaine. She looks different in this film. I do not think I have ever seen her with long hair before except "Can Can" and then she pretty much kept it up.
So she is a mother with two kids, well off. And her brother is kind of a wild type. That's "Joel" of the title, by the way. He is played by Perry King.
So he starts acting strangely and then stranger and stranger. Then his girlfriend ends up dead and with her head removed from the body.
What is going on?
Slowly it turns out that Joel got into Santeria -- a voodoo like thing that blends Catholicism and is also used in the Martin Sheeh film "The Believers." And now he is possessed.
Shirley MacLaine is really good in the film and the only reason to see it other than her is to catch the location shoots in NYC. There are some really great shots and the camera is used well throughout the film. I should note that.
For a one-time view, you will be scared as it gets scarier. Repeat views and you'll notice inconsistencies.
Going out with C.I.'s "Iraq snapshot:"