Stuart Kelly was speaking outside a Sydney court where the DPP had just won an appeal to extend Kieran Loveridge's jail sentence to seven years over the one-punch death of Thomas Kelly.
A three-judge panel in the NSW Court of Criminal Appeal this morning decided to extend the initial four-year term by another three years.
Loveridge will now serve a minimum of seven years and a maximum of 10 years for the manslaughter of Mr Kelly in Kings Cross in July 2012.
In an emotional speech, the younger Kelly brother urged people to act against alcohol-fuelled violence.
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"I lost my brother to alcohol-fuelled violence," the 16-year-old said.
"I can tell you first-hand to experience this kind of pain at such a young age is too hard.
"It is my generation and yours, it's ours to begin this conversation at home across the dinner table, in our schools, our universities and among peer groups. You too can be a messenger of change.
"I will miss Thomas deeply for the rest of my life but somehow I know he will always be there by my side just as he was during the 14 years we had together."
NSW Attorney-General Brad Hazzard welcomed the court's decision.
"The NSW Government and the community wanted the sentence appealed and we thank the Office of the Director of Public Prosecutions for its work on the appeal," Mr Hazzard said in a statement.
"The NSW Government has since mandated minimum jail sentences for these kinds of deadly, alcohol fuelled assaults and has put in place lockouts to change the culture of drunken, dangerous behaviour in central Sydney."
