A $50,000 reward is being offered to help crack a cold case that has mystified Dunedin police for over a decade.

Tuitania Barclary

Police are appealing to anyone with information on Tuitania Barclay who was last seen in October 2002 when she was living in Dunedin.

The 29-year-old, known as Tui, was living at Wakari Road with her partner, with whom she had two children, and another child from a previous relationship.

Around September 2002 Tuitania had indicated that she was going to leave the relationship but appeared to be focussing on raising her children.

Her former partner, Bill Brown, reported her missing in February 2003, but inquiries failed to show up any significant leads.

The case was re-opened earlier this year when police suspected there may have been foul play.

The $50,000 reward offered today by police is "for material information or evidence, which establishes the location of Tuitania (Tania) Marama Barclay or her body, and or leads to the conviction of any person or persons responsible for the disappearance or death of Tuitania (Tania) Marama Barclay".

The reward offer remains in force until January 1, 2015.

"When she was last seen she had three young children - none of whom have ever known what happened to their mother," says Detective Senior Sergeant Malcolm Inglis who is overseeing the case.