3x17 - Crime Beat

It was a crime unlike anything ever seen before in Canada. The horror of the 'Wells Gray Murders' forty years ago still haunts investigators involved in the case, as well as family and friends of the victims. In August 1982, David Shearing stalked and murdered three generations of a family while they were out on a summer camping trip in B.C. After a long cross-country investigation, police learn the killer was always closer than suspected. What was the murderer's motive for such a horrific crime?