A post mortem examination will take place later on the body of Colin McLeister who died at an entertainment complex in Portrush yesterday.
A 34-year-old man is still being held by detectives investigating the incident.
Mr McLeister was a father of three from the Coleraine area.
It is thought he may have fallen down the steps in the club.
Police are appealing for anyone who witnessed an altercation on the first floor of the Playhouse at around 1am yesterday to contact them.
