Who is Bryan Smith and Bullet from On Writing: A Memoir of the Craft and what is their importance?

Bryan Smith is the man who was driving the blue Dodge van that hit Stephen King as he was walking on the side of the road near his summer home in Maine. Bryan Smith was camping at a campground nearby and had gotten a craving for a candy bar. Bryan Smith was driving into town with his dog, Bullet, when Bullet attempted to get into an ice chest that had some meat into it. While driving, Bryan turned around to stop the dog from eating the meat, causing him to drive onto the shoulder of the road where Stephen King was walking. Bryan Smith would be charged with driving to endanger and aggravated assault. Bryan Smith would eventually plead to the lesser charge of driving to endanger.