Man who killed Brisbane teen Cole Miller in one-punch attack sentenced to seven years' jail

The man who killed Brisbane teen and promising sportsman Cole Miller in a one-punch attack has been sentenced to seven years in prison.

New Zealand man Armstrong Renata was sentenced in the Brisbane Supreme Court on Friday.

The 23-year-old must serve 80 per cent of his sentence, meaning he will be eligible for parole in just under four years.

The offence carries a maximum penalty of life imprisonment.

Cole Miller was a budding polo player whose life was cut short in January 2016. Source: Supplied.

Renata punched Mr Miller, a champion water polo player, in the back of the head while out in the Fortitude Valley nightclub district in January 2016.

The 18-year-old suffered massive brain trauma, with his family making the heartbreaking decision to turn off his life support the following day.

It comes after Renata's co-accused, Daniel Maxwell, walked from court in August after being handed an 18-month suspended sentence for starting the fight that led to Mr Miller's death.