This is a rare look at never-before-aired video from 20/20’s iconic interview with the Menendez brothers. Erik and Lyle Menendez discuss with Barbara Walters about the closeness of their relationship - and how that may have had a part in them killing their parents. Lyle Menendez said the killing of his parents “happened, in part, because Erik wanted, needed my help” and blames himself “for not protecting him earlier.” Previously-unseen clips from the 1996 interview are now featured in 20/20's ne