"This is a tragic outcome and once again this year we're investigating the murder of a young person in our community," he said.
"The victim's family are tonight coming to terms with their loss and are understandably distraught."
A group of people was present when the assault occurred and police thanked those who came forward.
Police believe they have identified the person responsible for this incident. However, they are encouraging others to come forward.
"We are confident we know who assaulted this young man and are actively seeking him," Syme said.
"We believe this person was solely responsible for the injuries sustained by our victim, and he knows we are wanting to speak with him."
Anyone with information is asked to contact Police on 105 and quote file number 211204/5631.
Information can also be provided anonymously via Crime Stoppers on 0800 555 111.