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Ronnie and Reggie Kray were born on 24 October 1933 in Hoxton, East London, to Charles David Kray (10 March 1907 - 8 March 1983), a scrap gold dealer, and Violet Annie Lee (5 August 1909 - 4 August 1982). They were of English, Jewish, Irish and Romani Gypsy heritage. The brothers were identical twins, with Reggie being born ten minutes before Ronnie. Their parents already had a six-year-old son, Charles James (9 July 1927 - 4 April 2000).

Ronnie Kray shot and killed George Cornell, a member of the Richardsons (a rival South London gang), at the Blind Beggar pub in Whitechapel on 9 March 1966. The day before, there had been a shoot-out at Mr. Smith's, a nightclub in Catford, involving the Richardson gang and Richard Hart, an associate of the Krays, who was shot dead. This public shoot-out led to the arrest of nearly all the Richardson gang. Cornell, by chance, was not present at the club during the shoot-out and was not arrested. Whilst visiting the hospital to check up on his friends, he randomly chose to visit the Blind Beggar pub, only a mile away from where the Krays lived.  Ronnie was drinking in another pub when he learned of Cornell's location. He went there with his driver "Scotch Jack" John Dickson and his assistant Ian Barrie. Ronnie went into the pub with Barrie, walked straight to Cornell and shot him in the head in public view. Barrie, confused by what happened, fired five shots in the air warning the public not to report what had happened to the police. Just before he was shot, Cornell remarked, "Well, look who's here." He died at 3:00am in hospital.  Ronnie Kray was already suffering from paranoid schizophrenia at the time of the killing.  According to some sources, Ronnie killed Cornell because Cornell referred to Ronnie as a "fat poof" (a derogatory term for gay men) during a confrontation between the Krays and the Richardson gang at the Astor Club on Christmas Day 1965.  Richardson gang member "Mad" Frankie Fraser was tried for the murder of Richard Hart at Mr.Smith's, but was found not guilty. Richardson gang member Ray "the Belgian" Cullinane testified that he saw Cornell kicking Hart. Witnesses would not co-operate with the police in the murder case due to intimidation, and the trial ended inconclusively without pointing to any suspect in particular.
Kray twins