More than 20 years after a 43-year-old mother was murdered and her body dumped in a drainage culvert, police have announced a $1 million reward for information about her death.

Theresa Binge was last seen in Queensland in July 2003, but her body was found across the border in NSW 11 days later.

Ms Binge's family has never stopped campaigning for answers and will join investigators in Moree to call on the public for any additional information about the case.

Ms Binge was last seen alive at the O'Shea's Royal Hotel in Goondiwindi at midday on July 18, 2003.

She was wearing a horizontal striped black and yellow football jersey, silver track pants and white running shoes.

Family members grew concerned after days without hearing from her, and Ms Binge was reported missing on July 21.

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