Brandon was killed because of improper procedures on the set. A bill was sponsored in his name to force studios to work safer.
You see, hollywood studios (not all, but many) use real bulletts in part of their scenes. It is cheaper to just shoot something up for real and film it, rather than try to fake it using F/X. This unfortunately was the case in The Crows studio. After shooting somethings up and filming it, one of the real bullets got mixed in with the blanks, and that cost Brandon his life (and all of us a great star). If I recall, the studio blamed it on crunched prodcution times, and that some safety procedures were not followed because of it. Had somebody actually taken time and check what they were doing, Brandon would probably be alive today.