An alcohol-fuelled one-punch killer has been sentenced to eight years in prison for an attack on a man in a Queensland KFC car park.

Conrad Joseph Carter, 35, admitted to the manslaughter of Wayne Tolmie, who died in hospital after being knocked to the ground in June 2016 at Morayfield, north of Brisbane.

Carter was sentenced in the Brisbane Supreme Court on Friday to eight years in prison. He will be eligible for parole after serving three years.

Conrad Joseph Carter knocked out 50-year-old father Wayne Tolmie in the car park of the KFC at Morayfield, Queensland. Mr Tolmie died of his injuries

The court had earlier heard that Carter had been drunk on the night he approached the 50-year-old father, who was also very drunk and sitting on the street.

Mr Tolmie had been yelling at nobody in particular when Carter approached him saying 'Do you want a piece of me? Are you f***ing talking to me?'.

Carter then punched Mr Tolmie in the jaw, making a cracking sound so loud it could be heard from some distance away.

Mr Tolmie was knocked out and fell to the pavement, but Carter continued to punch him and was seen stomping down, before telling the man: 'Do you want to f***ing yell at me?', the Courier Mail reported.

He then tried to attack Good Samaritans who rushed in to help the injured man, who had a heart attack.

When Carter realised what had happened, he apologised and helped to give Mr Tolmie CPR, saying: 'Sorry, I didn't mean to kill him,' the court heard.

Paramedics had to perform extensive CPR to revive Mr Tolmie who was rushed to Royal Brisbane and Women's Hospital with critical head injuries from which he died.

Mr Carter waited at the scene for police.

50-year-old father Wayne Tolmie (pictured) died after Conrad Joseph Carter felled him with one punch

Soon after his death, Mr Tolmie's family and friends expressed shock and described him as 'one of a kind.'

Jennifer Bowden, the aunt of Mr Tolmie, said there had been 'a lot of crying' after Mr Tolmie and another friend died on the same day.

'May they both be at peace now and neither will be forgotten,' Ms Bowden wrote on Facebook.

Carter, an Aboriginal man with a history of alcohol problems, had been on probation and a suspended sentence at the time he killed Mr Tolmie.

He will be eligible for parole in May 2021.

In sentencing, Justice Sue Brown told Carter that he no doubt wished he had walked past Mr Tolmie on the night of the attack.

'Like you, he is a father. Like you, he is loved by his family,' she said.

'Many of his family are here and their pain is obvious. Nothing I can say or any sentence I can impose can take away that pain.