SNEAK PEEK: A bitter mystery turns into an ongoing nightmare during an all-new episode of Cold Case Files TONIGHT at 9/8c on A&E. | Cold Case Files

The murder of an Ohio woman in 1974 is solved more than 20 years later after police get a crucial clue--the woman's husband was seen building a coffin-shaped box about the time the woman disappeared. #ColdCaseFiles | Cold Case Files

Forensic Science: Solving Cold Cases | Full Episode