I Filmed Your Death (1970)

Sinopsis

A small town is rocked when a local man goes on a rampage in a movie theater, killing dozens as well as himself. Now, a year later, young filmmaker Pierce Lyndale adds salt to the wound when he makes the tragic decision to base a film off of this event and show it on the town's public access channel. As he attempts to throw a premiere party for himself, his friends ditch him, his community shuns him, and he finds out that not everyone wants to be in a movie.