David Muir Reporting – the killers in two mysterious cold cases about to be unmasked through stunning, cutting-edge forensic technology. See it unfold on an all-new 20/20 - premiering Friday night at 9/8c on ABC. Stream on Hulu. | ABC 20/20

David Muir Reporting : 9/11 - the moment by moment stories of heroism and bravery you have not heard. The powerful new 20/20 Event Special premieres Friday night 9/8c on ABC and stream on Hulu. | ABC 20/20

“The impact of one life being taken leaves a hole in the lives of so many people.” Survivors and family members reflect on the lasting legacies of the lives lost on 9/11, during David Muir’s ABC News special "9/11: The Day That Changed America." #ABC2020 https://abcn.ws/3A2adll | ABC 20/20