More than a fight: Was the death of an Indigenous teenager an accident or murder?

On New Year's Eve, 1983, the driver of a train passing through Kempsey in NSW made a grim discovery. The body of Lewis "Buddy" Kelly was strewn across the tracks. Police said the 16-year-old's death was an accident, but his family suspects foul play. The case is one of three eerily similar mysteries. Is there a pattern here? Allan Clarke investigates.