A Millwall football supporter has been jailed for two years after punching a rival fan who later died.

Andrew Lewis pleaded guilty to inflicting GBH on 56-year-old Nottingham Forest fan Paul O'Donnell in a car park outside Nottingham's City Ground.

The 50-year-old from Bromley had drunk seven pints of lager before the Friday night fixture on August 4 and said he used violence against Mr O'Donnell because he was saying "West Ham" at him.

Leicester Crown Court heard how the victim suffered a skull fracture and bleeding on the brain as a result of the "entirely unnecessary as well as aggressive blow".

Mr O'Donnell was found in a critical condition two weeks later at his house in Newark, Nottinghamshire, after falling down the stairs, and was pronounced dead in hospital on August 24.

Prosecutor Miranda Moore QC told the court doctors could not definitively say the injuries caused by Lewis were directly responsible for Mr O'Donnell's death.

As a result, she said no evidence would be offered on a manslaughter charge and Judge Gregory Dickinson QC said he would be directing a not guilty verdict.

Ms Moore said Mr O'Donnell suffered from memory loss and severe headaches when he was released from hospital after the initial attack.

The judge told Lewis: "This was an entirely unnecessary as well as aggressive blow to a man who, at that moment, was incapable of defending himself because he was looking away.

"You know that serious injury can be caused by serious violence because you have a previous conviction for causing grievous bodily harm.

"It could easily have been worse. Everyone should be safe to attend matches like this without having to experience or witness violence."

The court was told Lewis had another previous conviction in 2004 for assaulting a taxi driver in Cardiff - the same weekend as Millwall played Manchester United in the FA Cup final at the city's Millennium Stadium.

Mitigating, Matthew Sherratt said: "He has let himself down, he has let his family down and he has let his son down.

"He should never have punched Mr O'Donnell and he is sorry."

The match was won by the hosts 1-0 and had been brought forward by a day to avoid clashing with cricket at neighbouring Trent Bridge.