How high school students solved a serial murder mystery

They're called The Redheaded Murders, the brutal killing and dumping of up to 14 women along motorways in the American South more than 30 years. The murders remained a mystery, almost forgotten, until Mr Campbell's students from a small high school in Eastern Tennessee got on the case. They identified a serial killer connected to six of the murders. The work of the high school students is featured in a 10 part podcast called Murder 101. At one point it was the most listened to podcast in New Zealand. We'll talk to Mr Campbell and student sleuth Hannah Metcalfe.