Billy Waters (portrayed by Billy Jayne) is a minor character from the TV series Charmed, appearing in the Season One episode "The Wendigo".
He was a mortal man who lost his fiancée Laura to a Wendigo. After her death, he became obsessed with hunting and killing it. During this time, he met Agent Fallon, though he was unaware of her true nature.
After Piper checked the Book of Shadows, she met with Billy at Quake and told him what she learned about the Wendigo, including that it looked human during the day. Billy later met with Agent Fallon. When he lit a cigarette in front of her, she flinched at the sight of the flame. Billy then realized she was the Wendigo and she killed him by snapping his neck. His death was later avenged by the Charmed Ones.