David Muir News

For the first time ever, 20/20 and ABC Radio have teamed up to report new details on a crime that rocked the idyllic seaside town of Truro, Cape Cod the 2002 murder of Christa Worthington, found stabbed to death with her 2-year-old daughter, Ava, unharmed by her side.

ABC News' WORLD NEWS TONIGHT WITH DAVID MUIR ranked as the No. 1 evening newscast in Total Viewers (8.544 million) for the week of October 2, 2017, based on Live + Same Day Data from Nielsen Media Research. The ABC evening newscast led NBC Nightly News (8.174 million) by 370,000. David Muir anchored live from Las Vegas Monday through Wednesday after the deadly shooting.