Detectives are investigating the circumstances surrounding the death of a man in Merrigum early this morning.
Emergency services were called following reports a man had been assaulted at a caravan park on Waverley Avenue about 3.10am.
When police arrived, they found two men within the caravan park who appeared injured and unresponsive.
Local police provided immediate assistance to the pair and performed CPR on one of the men who couldn't be revived.
The other man was taken to hospital with serious but what is believed to be non-life-threatening injuries.
Homicide Squad detectives are attending the scene and will investigate the circumstances surrounding the death.
Officers from the Major Crime Scene Unit will attend to process the scene.
Anyone with information is urged to call Crime Stoppers on 1800 333 000 or log onto www.crimestoppersvic.com.au.