A man has been charged with murder after another man was found dead at a caravan park in Adelaide’s south.

Police were called to the BIG4 Port Willunga Tourist Park on Tuit Road in Aldinga just after 2pm yesterday after a man was found dead inside a cabin.

He has since been identified as Gary Hallam, 72.

Gary Hallam is believed to have known his alleged killer. (Supplied)

At the same time, a 49-year-old Aldinga man presented himself at a police station, where he was arrested.

He was then taken via ambulance to hospital.

His hands were cuffed and also placed inside paper bags, potentially to preserve evidence.

That man has now been charged with murder, and he has been refused bail.

Police believe the incident was not random and the two men are known to each other.

The 49-year-old man was taken to hospital, and will now face court at a later date. (Nine)

Investigators were on the scene for much of yesterday, with park residents noticing the police presence.

“[It’s] busy,” one woman said.

“Cars, detectives, police officers, much bigger than I expected it to be.”

The 49-year-old man will appear at Christies Beach Magistrates Court at a later date.