A thug who killed a man in a disgusting coward punch attack has had his jail sentence extended after he assaulted a prison guard.
Armstrong Renata, 24, from New Zealand, was sentenced in October to seven years' jail for killing Cole Miller, 18, during a night out in Brisbane's Fortitude Valley.
Mr Miller was celebrating schoolies in January 2016, when he was hit in the back of the head by Renata, Northern Star reported.
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Armstrong Renata, 24,(pictured) was sentenced in October to seven years' jail for killing Cole Miller, 18, during a night out in Brisbane's Fortitude Valley
Cole Miller (pictured) died after a coward punch attack which caused his head to hit the pavement
He was knocked out, which caused his head to hit the pavement and later resulted in his death.
Renata was arrested for the attack and has been in custody since January 3, 2016.
Since his sentencing, Renata has been involved in a number of assaults with prison guards.
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ShareHe pleaded guilty to the charge this week in Maryborough Magistrates Court and was sentenced to an extra three months in jail on top of his seven year sentence, the Northern Star reported.
Despite being sentenced for the killing of Mr Miller, it was Renata's friend, Daniel Maxwell from New Zealand, who hit Mr Miller first.
Daniel Maxwell (pictured) delivered the first blow on Cole after punching him in the chest
Renata (pictured) had his sentence extended for another three months after assaulting prison guards
Maxwell had tried to start fights with others during the night out, before he came up to Mr Miller.
He asked Mr Miller, 'Do you want to see something funny?' before he punched him in the chest.
Maxwell walked free from court in February after being given in 18-month suspended sentence.
When Cole's father saw Maxwell walk free from court, he called Home Affairs Minister Peter Dutton to tell him how an accomplice in his son's death was walking free.
Mr Dutton called Queensland Police and Border Force, which saw Maxwell taken back into custody and then deported to New Zealand.
Cole's father, Mr Miller (pictured) called Peter Dutton about Maxwell walking free from court
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