 Actor Alec Baldwin's involuntary manslaughter trial and the death of a cinematographer on a movie set is underway. CBS's Elizabeth Campbell is on the prosecution's case. They're going to argue that Baldwin was there as an actor and that movie sets are just different. And as an actor, all he was focused on was acting. It was the armorer for the movie who loaded the gun. It was a props master who handed the gun to Baldwin. He was focused purely on the mindset of his character and was using the gun as the character would have.