FOUR men and a woman have been interviewed by police over the past week in relation to the disappearance of Wangaratta mother Kath Bergamin.
Police announced on Thursday that they had spoken to the quintet as part of their continuing probe into the 2002 mystery.
Ms Bergamin, 37, vanished from a Wangaratta home in Brien Crescent in August of that year after having separated from her husband John, with whom she had lived at Cheshunt with their three children.
Police suspect foul play with Ms Bergamin's body never found.
Since last Friday, police have spoken to the group of five, three of whom come from the North East.
They include a 33 year-old Docker woman and men from Cheshunt, 60, Wangaratta, 51, Melbourne, 37, and Yoogali near Griffith, 30.
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The five have been released by the police pending further enquiries.
Police described the new development as confirmation of the force's "commitment to providing answers to Kath's family and community".
DNA testing and forensic re-examination has also been conducted on a number of exhibits found at her home.
Police are urging the person who sent an anonymous letter to investigators in March 2017 (containing very specific information about Kath Bergamin’s murder) to come forward.— Victoria Police (@VictoriaPolice) August 23, 2018
Anyone with information is urged to contact @CrimeStopperVic. Read more → https://t.co/8yVYa3Ff96 (2/2) pic.twitter.com/3KXK7JsbO3
In March 2017 police received an anonymous letter with very specific information about Ms Bergamin's murder, including who was involved.
Detectives are still keen to hear from the writer of the letter, which is a key part to the investigation.
A $1 million reward remains on offer for information leading to the apprehension and subsequent conviction of the person or persons responsible for Ms Bergamin's murder.
Police noted that the Director of Public Prosecutions may also consider granting indemnity from prosecution to anyone who provides information as to the identity of offenders in this matter.
Anyone with information about the case is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppers.com.au