An intimate group gathered in the rain on Tuesday evening for a candlelight vigil to remember her, as family members made fresh appeals for information that can bring everyone closure.

Ms Vaughan, then aged 31, left a local nightclub and was last seen getting into a red car on Keppel Street at about 3.50am on December 7, 2001.

A coronial inquest conducted in 2009 found Ms Vaughan had died, but her cause of death has remained undetermined and her body has never been located.

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A recording from Ms Vaughan's siblings, Kylie Spelde and Adam Vaughan, was played at Tuesday's vigil, in which the two spoke of the heartbreak of losing their sister and still not knowing what happened to her 20 years later.

"It's very hard to have lived 20 years without Janine and, I'm telling you right now, I can't go for another 20 years without her and not knowing what's happened," Ms Spelde said.

"I'm begging you from myself, please come forward and give us the information that we need to be able to lay Janine to rest and be able to move on with our lives.

"I'm exhausted. I'm actually exhausted now. I've had enough."

Ms Vaughan's family maintains that there are people in or connected to the Bathurst community who have information about what happened.

They have asked anyone with any information to get in contact with police.

"Twenty years is a very long time to be without our sister," Mr Vaughan said.

"... We do believe that there is a killer in [Bathurst] and you need to come forward now. It is an absolute plea from the bottom of our hearts that you come forward now and this does not go on any further."

Ms Spelde said that grandparents have died not knowing what happened to Ms Vaughan, and she holds fears that their father will also die without closure.

"We really need your help now more than ever to come forward and help us with the answers that we need for Janine," she said.

They thanked everyone for continuing to keep Ms Vaughan in their thoughts, saying that they were grateful for the support.

There is a $1 million reward available for information that leads to the arrest and conviction of the person or people responsible for Ms Vaughan's death.

Anyone with information that may assist investigators is urged to contact Crime Stoppers on 1800 333 000 or to make a report through the Crime Stoppers online portal. Information will be treated in strict confidence.

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