A thirteen-year-old girl was murdered. A major investigation followed. Why didn’t it lead to an arrest?

In March 1978, after Denise McGregor was found on Merriang Road, Victoria Police began an extensive homicide investigation.

Forensic examinations were conducted. Witnesses were interviewed. Lines of enquiry were opened — and, in some cases, abandoned.

Despite this, no one has ever been charged.

Over time, the investigation shifted into a cold case, subject to periodic review and renewed appeals.

This episode examines what was done, what was known, and how early investigative decisions shaped a case that remains unresolved.

Content warning: This episode discusses the sexual assault and murder of a child. It includes references to violence and investigative material. Listener discretion is advised.