 Opening arguments today in actor Alec Baldwin's involuntary manslaughter trial in New Mexico. Prosecutors claim Baldwin was responsible in the shooting death three years ago of cinematographer Helena Hutchins. Baldwin was rehearsing a scene for the film Rust when he pointed a Colt .45 toward the camera and a live bullet was fired. The film's armorer has already been convicted in the shooting death. If Baldwin is convicted, he could face up to 18 months in prison.