Diane is a character from the film Jaws 2.
She is consumed in a gas canister explosion indirectly caused by the marauding shark (Brucette).
Diane is a water skiing driver. After her friend Terry is devoured while water skiing following her boat, she attempts to flee, but the shark hits the transom and knocks her to the floor of the boat.
After screaming and stumbling, Diane throws a gas tank at the shark, inadvertently dousing both her and the shark with gas. She then shoots the gas-drenched shark, and the shark's cheek catches fire.
In the ensuing panic, Diane's pants catch fire too, and the boat suddenly explodes. Later, as Chief Martin Brody notices charred remains of her boat on the beach shore, he goes into the water to bring some of it in, and is then met with an awful shock as he discovers her burned corpse among the wreckage.
- It is implied that she may be Terry's mother. The Wikipedia page lists this.