Who is Barry Cox from I Know What You Did Last Summer and what is their importance?

Barry Cox was the driver of the car that hit and killed David Gregg. He is concerned about getting caught because he was eighteen, and an adult at the time of the accident. Barry made the decision not to stop or go back to help. He is also the one who insisted create a pact not to tell what happened. Barry dates Helen among others, and he is physically attacked (shot) by someone who tells him on the phone that he has pictures of what happened last summer.