The wife of a NYC businessman is suspected of murdering him with help from her brother -- why would she want him dead and why did it take more than two decades to crack the case?

Correspondent Richard Schlesinger and 48 HOURS go inside the riveting real-life murder mystery behind the death of Pilmar and the search for answers.

A brutal murder and police have DNA evidence — could a discarded cigarette lead investigators to a possible killer and close a case two decades later? CBS News correspondent Anne-Marie Green reports.