 Testimony is underway now in Alec Baldwin's involuntary manslaughter trial in New Mexico, where the actor's accused of killing a cinematographer with a loaded prop gun on a movie set in 2021. Baldwin's attorney, Alec Spiro, says prosecutors have a weak case. The gun was double checked, verified it was a cold gun, not an actor's responsibility to check. Safety was ensured before. Baldwin said repeatedly he never pulled the trigger. CBS News Brief. I'm Monica Ricks.