Freshwater (2016)

A silent and swift predator is preying on helpless college students and the unsuspecting inhabitants of the sleepy town of Helena, Alabama. Before long, another devastating attack stains the waters red, as the alligator expert, Brenda Gray, and the local officer, Sheriff Jones, try their best to shed light on the mystery. More and more, the death toll keeps rising, and there's no telling when the killings will end. Now, the quiet fresh-water assassin is waiting for the right time to strike again. What kind of hideous creature is lurking below the surface?