'Rust' Actor Says Halyna Hutchins' Death 'Got Leaked To The World' Before Cast And Crew Found Out

A new episode of "20/20" delves deeper into the day Alec Baldwin's gun went off on the set of "Rust," killing cinematographer Halyna Hutchins. Eyewitnesses and cast and crew members who were on set that day shared their accounts of the devastating incident with the show, and actor Devon Werkheiser told "20/20" that many of them were waiting on an update as to Halyna's condition when they found out through the news that she had passed. "20/20" airs Dec. 10 at 10/9c on ABC.