La Llorona (approximately "lah yoh-ROH-nah", Spanish for "the crying woman"), sometimes called the Woman in White or the Weeping Woman is a figure in North American folklore, the ghost of a woman crying for her dead children that she drowned. Her appearances are sometimes held to presage death and frequently are claimed to occur near bodies of water, particularly streams and rivers. There is much variation in tales of La Llorona, which are popular in Mexico and the United States (especially in Mexican American communities), and to an extent the rest of the Americas.
The boys came upon a Woman in White in Jericho, California. She was hitch-hiking and seducing men, then punishing them for being unfaithful by killing them brutally. After chasing after the boys with the Impala and attacking Sam, they managed to get her into her old house, which forced her spirit to face the children she'd murdered. As her children hugged her, she disappeared in a violent flurry of light and ectoplasm.