Constance Welch is a character from the Pilot episode of Supernatural. She was a "woman in white" who killed unfaithful men on the highway.
Background[]
In 1981, after drowning her two children, Constance drowned after she jumped off Sylvania Bridge near the Centennial Highway in Jericho, California. She claimed to the police that they had died accidentally by being left temporarily unatended. But she had actually gone insane and drowned her children after finding out her husband had been unfaithful.
After her death, she haunted Centennial Highway, appearing as a hitchhiker to young men. She would beg to be "taken home," but then protest that "she could never go home." She would then kill the young men after she tempted them into being unfaithful. Ten men died on the same five mile stretch of highway before Dean and Sam Winchester investigated and intervened.
When Dean and Sam forced her to enter her old home, the ghosts of her two children appeared, and her spirit was destroyed.