Australian police have reopened their investigation into the 1993 murder of long-time AC/DC manager Crispin Dye.

The Sydney Morning Herald reports the New South Wales government announced that a $100,000 reward would be offered for information leading to the arrest and conviction of those responsible for the unsolved death more than 20 years ago.

He was also a singer-songwriter and had been out celebrating the release of his own CD, 'A Heart Like Mine', in Surry Hills and Darlinghurst on the night that three young men of Pacific Islander appearance were seen standing over him in Little Oxford Street, near Taylor Square, about 4.30am on December 23, 1993.

Dye had been bashed, robbed and left lying unconscious. He died two days later - on Christmas Day, 1993 - in St George Hospital in Sydney. A coronial inquest was held in 1995, but no charges have ever been laid.

"There are people out there who know those responsible for Mr Dye’s death and we’re hoping this reward may prompt them to get in touch with police,” said Detective Superintendent Mick Willing, the commander of the Homicide Squad.

“By all accounts, Crispin Dye was a fun-loving, friendly and decent man, who was robbed of his life far too soon. We are absolutely committed to getting to the bottom of this case and bringing those responsible for an innocent man’s violent death to justice, but we won’t be able to do it without assistance from the public."

Police are urging anyone with information about this incident to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page: www.police.nsw.gov.au. Information provided will be treated in the strictest of confidence.

AC/DC recently completed recording a new album without founding member Malcolm Young, who remains in hospital to address some health issues.