SENTENCING for the man who killed Sunshine Coast teen Cole Miller with one punch has been delayed.

Armstrong Renata, from New Zealand, pleaded guilty to unlawfully striking Mr Miller when his case was committed from the lower courts to Brisbane Supreme Court last year.

He was to be sentenced this morning under tough new laws introduced in Queensland in 2014 designed to combat alcohol-fuelled violence.

Cole Miller.
Cole Miller. FACEBOOK

Renata, who was 22 at the time of the attack, could face the maximum penalty of life behind bars, or will have to serve 80% or 15 years of any jail sentence handed to him.

Mr Miller, 18, died after being struck on January 3 last year while walking through Fortitude Valley in the early hours of the Sunday morning.

He suffered brain trauma and his family later had to decide to turn off his life support in hospital the following day.

But at Brisbane Supreme Court today, that sentence was adjourned to July 21.

Members of Renata's family were in court as Corrective Services staff escorted him to the dock.

The defence and prosecution had made a joint application for the adjournment.

The court heard the adjournment was due to new charges related to Renata's behaviour in custody.

The defence had not yet addressed Renata about the charges or explained how those charges might proceed.

A second man is also charged over Mr Miller's death but his case is still progressing through the courts.