BABY HOLLY FOUND: After a young couple is murdered, their true identities lead to a shocking twist about their missing baby. DavidMuirABC reports on the case and brings us his 20/20 interview with Baby Holly. Watch the '20/20' encore air again tonight (Aug. 21st) at 9/8c on ABC. Stream on Disney+ and Hulu (S46, E6). #TrueCrime #BabyHolly #Investigation