Supernatural (TV series)/Recap/S03/E05 Bedtime Stories

Season 3, Episode 5:

Bedtime Stories
Sam and Dean investigate a series of fairy-tale themed murders. A little girl with dark hair has been seen at the scene of each crime, and the brothers find out that it's the projected spirit of a girl poisoned and put into a coma by her wicked stepmother.

Tropes

 * The Brothers Grimm
 * Creepy Child