DATELINE MONDAY PREVIEW: Deadly Secret

01:00

Before the Menendez Brothers, the Bobbitts or even O.J., Pamela Smart was television's first true crime fascination after her husband was found murdered. When police began to investigate, they discovered that Smart was keeping a big secret. She speaks out to Andrea Canning about the case that made world-wide headlines and inspired a Hollywood movie. Airs Monday, July 29 at 10/9c on NBC.