A scene examination was to be completed today, before a post mortem examination to determine the cause of death.
Inquiries were being made into a function in Bonnett Rd, where a number of people had gathered that night.
"This is a tragic start to the new year for a family," Detective Inspector Kevin Burke said.
"This appears to be an unprovoked attack which has resulted in this man's death."
Police were appealing for information from anyone who attended the party or earlier saw the victim, who at the time was wearing black shorts, a grey hooded sweat shirt and steel capped work boots.
People could contact police by phoning 09 408 6500 or passing on a message anonymously through Crimestoppers on 0800 555 111.