Death Screams (1982)

Locals are celebrating the last night of carnival, such as newly in-love couple Bob and Kathy, coach, Neil Marshall, waitresses, timid blonde Lily and comely, nubile Ramona, their boss Jackson and learning difficulties teenage peeping tom Casey who's dad Avery is the town sheriff. Several them decide to spend the night down at the river, where a unknown double homicide climaxed there some nights before. But among the fairgoers is the one responsible for the deaths and as he/she lurks in the shadow troubled over a tragic past (or just about one thing or another) deciding to take his/her frustrations out with a machete on those he/she blames for all the misfortunes in his/her life. Following the group back to his/her riverside stamping grounds he/she sets about ensuring no one leaves the area alive.