Matt Blyth

When members of a workforce began falling violently ill, locals believed a virus was sweeping the area, but after the death of two men it became clear that the only impurity was a serial poisoner with a toxic past.

Patrick Mackay was arrested in 1975 after killing Father Anthony Crean. He had butchered the priest with an axe and left him in a bath of blood. The killer's confessions would leave the police in a state of shock.