Patterns of a serial killer

Jeff Maher worked on almost 200 murder investigations in 15 years at the Victoria Police Homicide Squad. Now he trains detectives at the police academy. Maher tells Real Crime's Adam Shand how serial killer Peter Dupas was brought to justice for the murders of Nicole Patterson and Mersina Halvagis. Dupas was brought undone by his modus operandi. Maher says investigators continue to pursue Dupas for other murders with that unique signature.  

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