'Witchcraft' suspected in man's disappearance from NSW town 27 years ago

"Witchcraft" is thought to be a potential factor in the disappearance of a man from the northern NSW town of Armidale 27 years ago.

Police today announced the reward for information on what happened to Bill Roach has been increased to $1 million.

Mr Roach, then 25, was last seen on New Year's Eve in 1993 on a street in Armidale.

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In the following years, a rural property on the town's outskirts has been searched after a coronial inquest concluded it was likely Mr Roach had died.

As well as possible links to a drug syndicate, police are also investigating black magic and witchcraft.

In the days leading to his disappearance, Mr Roach had remarked that he had been cursed by witches.

"There were people who might have been associated with him at the time that might have been involved in witchery," Detective Superintendent Steve Laksa said.

"(If) he believed in it, I'm not sure."

Mr Roach's younger sister Kim is pleading for anybody with information to let police know.

"He was my mate, and that's just been ripped away," she said.

Anybody with information should call Crime Stoppers on 1800 333 000.