Deadly Sins: Lust

Marissa Calhoun sits in front of the lagoon, a beach-like swimming hole nestled Cairns, Australia’s foreshore. Tonight the lagoon is hers and hers alone.
Or is it?
A tall figure steps out from behind the tree, his face cloaked beneath a dark hoodie. His footsteps slap against the pavement, fast and hard. Twenty feet, then fifteen, then ten.
Instinct kicks in and Marissa breaks into a sprint, but she’s too late. His hand claws into the back of her head. Grabbing a fistful of her hair, he plunges her face into the water.
Who is Marissa’s vicious attacker?
And why does he want her dead?