Diane is a water-skiing driver. After her friend Terry is devoured while water-skiing, she attempts to search for her but the shark hits the transom and knocks her to the deck. After screaming and stumbling, Diane attempts to kill the shark by throwing a gas tank at the shark, inadvertently dousing both her and the shark with gas. She then shoots the gas-drenched shark with a flare gun. In the ensuing panic, Diane and the shark are engulfed in flames and the boat explodes. Though the shark manages to escape, it is left severely disfigured by the explosion.
Later, as Chief Martin Brody patrols the beaches, he notices the charred remains of her boat floating near the shore. As he wades into the water to bring it in, he shockingly discovers her burnt corpse.