Answer by taking a quote from the following article:

George Best (22 May 1946 - 25 November 2005) was a Northern Irish professional footballer who played as a winger for Manchester United and the Northern Ireland national team. In 1968, he won the European Cup with Manchester United, and was named the European Footballer of the Year and FWA Footballer of the Year. The Irish Football Association described him as the "greatest player to ever pull on the green shirt of Northern Ireland". Born and brought up in Belfast, Best began his club career in England with Manchester United, with the scout who had spotted his talent at the age of 15 sending a telegram to manager Matt Busby which read: "I think I've found you a genius."

Best suffered from alcoholism for most of his adult life, leading to numerous controversies and, eventually, his death. In 1981, while playing in the United States, Best stole money from the handbag of a woman he did not know in order to fund a drinking session. "We were sitting in a bar on the beach, and when she got up to go to the toilet I leaned over and took all the money she had in her bag."  In 1984, Best received a three-month prison sentence for drunk driving, assaulting a police officer and failing to answer bail. He spent Christmas of 1984 behind bars at Ford Open Prison. Contrary to popular belief and urban legend he never played football for the prison team. In September 1990, Best appeared on the primetime BBC chat show Wogan in which he was heavily drunk and swore, at one point saying to the host, "Terry, I like screwing". He later apologised and said this was one of the worst episodes of his alcoholism.  Best was diagnosed with severe liver damage in March 2000. His liver was said to be functioning at only 20%. In 2001, he was admitted to hospital with pneumonia. In August 2002, he had a successful liver transplant at King's College Hospital in London. He haemorrhaged so badly during the operation that he nearly died. The transplant was performed at public expense on the NHS, a decision which was controversial due to Best's alcoholism. The controversy was reignited in 2003 when he was spotted openly drinking white wine spritzers. On 2 February 2004, Best was convicted of another drink-driving offence and banned from driving for 20 months.

what was another controversy?
Best was diagnosed with severe liver damage in March 2000.