SCOTT Moon may have seen an episode or two of Cold Case on television, but it doesn't get any more real than his present job.

Scott is the officer-in-charge of Rockhampton police's CIB branch and is one of two policemen, based at the city's station, who are central to a cold case that has been reopened in Central Queensland.

A reward of $250,000 is offered for information which leads to the conviction of those responsible for the disappearance and suspected murder of Robert Deric Grayson and Derek Wade Van Derpoel who went missing nearly 20 years ago.

The pair was involved, with another person, in share-cropping in the Kroombit Tops, about 85km south-west of Gladstone, and were last seen alive in May 1993.

On August 8, 1994, Mr Grayson, 26, was reported missing to Gladstone police.

On September 2, 1994, his companion Mr Van Derpoel, 23, was reported missing to Calliope police.

Detective Senior Sergeant Moon said information from a phone call several months ago prompted a review of the file and the case was now officially reopened.

He said further information from witnesses supported the theory the pair met with foul play. However, he didn't detail the information.

Det Snr Sgt Moon, who has a background in solving old crimes, is being supported by Inspector Tony Wood, also based out of Rockhampton, who had the lead role in the initial investigation.

"People should come forward without fear," Det Snr Sgt Moon said.

"If you were afraid then, there's no need to be now.

"It is often the smallest piece of information that can make all the difference."

Anyone with information should call 1800 333 000.