A $1 million reward will be offered to help find whoever killed a NSW mother and dumped her in a drain near the Queensland-NSW border.

NSW police will today travel to Moree in the state's far north to announce a massive increase to the amount of money on offer for information into the murder of Theresa Binge.

She was 43 when he was last seen about midday on July 18, 2003, at O'Shea's Royal Hotel in Goondiwindi on the Queensland side of the border.

The Boggabilla woman was reported missing the following Monday but by July 29, her body had been found.

The mother was dumped in a drainage culvert on what was then called Boomi Road – now Mungindi-Goondiwindi Bridge Road – about 12 kilometres south of Goondiwindi, in NSW.

An inquest in 2007 found Binge had been murdered, but

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