When the Aramoana shooting happened in 1990, Bristol-born Paul Mullen was living near Dunedin. The tragic event, which saw many people he knew injured or killed, piqued Dr Mullen's curiosity in forensic work and he soon pivoted to become a full-time forensic scientist.
In the years since, he has traced many "lone wolf" mass murderers, exposing the troubling patterns that underpin their actions. Dr Mullen joins Jim to discuss what he has learned in his decades of meeting these killers, and his new book Running Amok.
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