we would consider a live round a bullet live because it did fire from the weapon and obviously caused the death of mrs. hutchins and injured mr. sousa. >> meanwhile, court documents released wednesday revealed the film's assistant director admits he failed to fully check the prop firearm before handing it to baldwin. and two crew members tell cnn that the lead armour on set had mishandled weapons during a previous film project. cnn's josh campbell has more now on the investigation. >> reporter: isa, we are learning new details about the circumstances surrounding that fatal shooting of cinematographer halyna hutchins. they suspect it was a live round of ammunition inside a gun fired by actor alec baldwin that ultimately resulted in her death. now, there are a number of questions that remain, specifically how did a live round of ammunition actually make its way onto a set. i posed the question to the sheriff. he said that very much remains