Murder by Numbers

A pair of murders linked by a mysterious note puzzles police.

Two bound and gagged bodies are found in a house fire in Billings, Montana.

A woman is found murdered on a hiking trail, and her husband is missing.

Firefighters discover bullet-ridden bodies when responding to a truck fire.

Police and neighbors are baffled when a woman is murdered in her home.

A predator who's been stalking women escalates from rapist to killer.