Emergency services, including two ambulances, rushed to the park shortly after 11pm and tried to revive the young man.
Despite efforts to save him, he died at the scene.
At the time of the death, Acting Detective Inspector Warrick Adkin said the attack was "an absolutely tragic event for the family".
"They are completely devastated to lose a much-loved son and brother."
The man and his friends were at a property playing music before they moved to the park.
Adkin says two men started an attack against the group socialising at the park.
They fled afterwards. There was no information to suggest they were known to the victims.
In November, two of the men, aged in their early 20s, denied charges of murder.
The two other men denied a charge each of aggravated robbery in relation to the case.
A case review hearing will be held on May 26.