Conversation so far:
Who was George Cornell?
George Cornell was an English criminal and member of the Richardson Gang, who were scrap metal dealers and criminals. He was shot and killed by Ronnie Kray.
When did Ronnie Kray commit the murder?
Ronnie Kray shot and killed George Cornell at the Blind Beggar pub in Whitechapel on 9 March 1966.

Question: Why did he shoot him?
Self-contained rewrite: Why did Ronnie Kray shoot George Cornell?