Forensic FIles: Death in the Rocky Mountains

In August 1974, hiker and photographer Michele Wallace disappeared in the Rocky Mountains in Colorado, USA. Thirty planes and 400 rescue workers failed to find any trace of her. Then, five years later, another hiker found a piece of human scalp with plaits attached - the hair was matched to a hairbrush belonging to Michele. A "cold case" forensic investigation was opened to find out what had happened to Michele...