Episode: 2×19 (Season 2 Episode 19)
Name: Folsom Prison Blues
Originally Aired: Apr. 26, 2007

Plot: When a ghost begins killing off inmates one by one at prison, Sam and Dean voluntarily go into the penitentiary to investigate the deaths from the inside. However, when FBI agent Henrickson takes over the murder cases, the brothers soon find that getting out of the prison may be more difficult than finding the murderous ghost.