S5·E10 Half-Way Horrible

Roger Lassen is a manufacturer who kills his friend by burying him alive in the South American jungle to finish the development of a chemical preservative. He's haunted by the memories of the incident. The earnings will make him rich but he can't get it past the FDA regulations. Soon his past returns and he starts seeing his dead friend everywhere he looks. A voodoo priestess offers to help exorcise his dark side. The spell works but at the most horrible cost.