An unsolved homicide haunted a city for decades. Officials say the killer was there all along.

On a cold, snowy night 45 years ago in Billings, Mont., someone entered the home of Clifford and Linda Bernhardt and brutally killed them.
The 24-year-olds had saved for years to build a home and finally settled down on the quaintly named Dorothy Lane in the fall of 1973. It turned out their time there would be brief and would end in unspeakable tragedy.