Forensic scientist Dr Paul Mullen was living near Dunedin joins Jim to discuss what he has learned in his decades of meeting lone mass murderers.

Forensic scientist Dr Paul Mullen was living near Dunedin joins Jim to discuss what he has learned in his decades of meeting lone mass murderers.

Forensic scientist Dr Paul Mullen was living near Dunedin&nbsp;joins Jim to discuss what he has learned in his decades of meeting lone mass murderers.

Diving inside the psyche of lone mass murderers

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Diving inside the psyche of lone mass murderers

Diving inside the psyche of lone mass murderers