Oxygen's 'Deadly Cults' explores the dark world of cults that kill. The limited series investigates murder cases and exposes deadly cults. One of the four hour-long episodes dives into the chilling tales of a self-proclaimed vampire. Frank Stanfield, a local journalist at the time of one of the murders, discusses his coverage of the unraveling case, and what viewers can expect. 'Deadly Cults' premieres on Sunday, February 10 at 8pm ET/PT.