A murder unearths an unsolved mystery from years earlier; as the connection between the two cases becomes clear, a long -hidden truth surfaces.

The broadcast features a new interview with Los Angeles District Attorney George Gascón, who recently filed a motion for a resentencing hearing for the brothers. As a scripted tv show reignites public interest in the Menendez case, Dateline will report on the latest, including a letter seemingly written by Erik to his cousin before the murders.

During The Menendez Brothers: Chance at Freedom, the prosecutor from the brothers' 1993 trial, Pamela Bozanich, opens up about defending herself against a wave of recent online criticism. She tells Morrison in a new interview that she bought a Mossberg shotgun to arm herself, which is the same type of gun used in the killings of the brothers' parents.

The episode also features interviews with additional key players in the case, including never-before-aired excerpts from Morrison's 2017 interview with Lyle.