Glenville 3 (1970)

Three years after a series of murders in Glenville, Ohio, tabloid journalists travel back to the site of the original murders to stir up controversy up and find themselves in the midst of a copycat killing spree. The killer also seems to be interested in a teenager named Sara, who is sister of the serial killer from the first two movies. Add in a crooked ex-cop, arrogant sheriff, car thief, several plot twists, and an ending inspired by Scream 3 and you get this movie.