No bail in 'vicious' Adelaide murder case

A 24-year-old man has been remanded in custody after being charged with the murder of Nathan Russell, who was found dead in his Adelaide unit on Australia Day.

The man appeared in Adelaide Magistrates Court on Thursday where his identity was suppressed while police investigations continue.

He made no application for bail and will return to court in April.

Police said previously they believed Mr Russell had been targeted in the "vicious" attack.

It was thought the 46-year-old was killed some time in the previous 24 hours before his body was found, but detectives declined to reveal the nature of his injuries for operational reasons.

Detective Inspector Brett Featherby said a number of lines of inquiry were being pursued and detectives were keeping an open mind.

"Investigators believe that people have knowledge of what has occurred to Nathan and knowledge of the circumstances leading up to his death," Insp Featherby said.

"We're seeking anyone with information to come forward and do the right thing by his family."

Inquiries on Thursday also included the search of three properties in the city and in Adelaide's southern suburbs.