One of the first psychiatrists who ever taught me exclaimed, after a patient he had just examined left the room, “A psychopath of the first water!”. It was a phrase that I never forgot, and if ever there were a psychopath of the first water, it is Joanna Dennehy, the 31-year-old woman who stabbed three men to death, disposing of their bodies as if they were inconvenient trash, and nearly killed two others at random, all with a terrifying coldness of heart and lack of remorse.

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