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.
Why did Ronnie Kray shoot George Cornell?
According to some sources, Ronnie Kray killed Cornell because Cornell called him a fat poof, a derogatory term for gay men, during a confrontation at the Astor Club in 1965.
Was Ronnie Kray charged with murder?
In March 1969, the Kray twins were convicted for the murders of Cornell and McVitie.

Question: What was his sentence?
Self-contained rewrite: What was Ronnie Kray's sentence?