Mr Warren, aged 24 at the time of his disappearance in 1989, was well-known to Illawarra audiences as a WIN TV newsreader and weatherman.

He was last seen driving along Oxford Street, Darlinghurst, on July 22, 1989. Mr Warren's keys were found two days later on rocks below a cliff at Marks Park in Tamarama, and his car was found nearby.

His body was never found.

His death was initially ruled as a "probable accident," but a campaign by his family saw the case reinvestigated. A 2001 coronial inquest slammed the initial police investigation as "lacklustre", "disgraceful" and "shameful," finding that Mr Warren had likely been murdered amidst an "epidemic" of "poofter bashing" cases in the Tamarama area, a well-known meeting place for gay men in the 1980s.

On Tuesday, a $100,000 reward was offered for information on the disappearance of Mr Warren, as well as two other men who disappeared or died in the same area in similar circumstances.

French man Giles Mattaini, 27, disappeared on September 15, 1985. He was last seen walking a track at Tamarama, and was later ruled dead by the coroner.  

John Russell, 31, was found dead at the bottom of the Marks Park cliff in November 1989. His injuries were consistent with a fall from the cliff.  

All three incidents have been reviewed by the Homicide Squad’s Unsolved Homicide Team in recent years.

Homicide Squad Commander, Detective Superintendent Michael Willing, said the matters had been reviewed based on the Coroner’s findings that they were suspicious in nature and possibly the result of gay hate-related crimes.

“We believe there are still people in the community who know what happened to these men and we hope these rewards will be an incentive for those people to come forward,” Det Supt Willing said.

“We will follow up each and every piece of information that is provided to us. We are committed to resolving these three cases and being able to provide answers for the families of these three men.”

Speaking on behalf of the families of Mr Warren and Mr Russell, Peter Rolfe from the Survivors After Murder support group said, “For the past 26 years we have been haunted by the deaths of Ross, John and Giles, and suspect there are witnesses or others who have information about these matters that are similarly haunted by the knowledge that they hold.

“We would implore you to take advantage of the rewards being offered, so that not only may our haunting be resolved but in some small way, your haunting may also be relieved.”

Police are appealing for anyone with information to contact Crime Stoppers on 1800 333 000.