A woman who fought for years to clear the name of her daughter's teenage boyfriend after he was falsely accused of causing a crash with a police car has gone missing.
Denise Potter, 53, disappeared in the space of about five minutes at about midday on Sunday, while weeding the garden at her daughter's Dunedin home.
Inspector Mel Aitken said Mrs Potter was barefoot and only had the clothes she was wearing - a striped grey and black top and jeans.
"We do have some very grave concerns for her safety and we're urging people or anybody with any information to contact police."
Ms Aitken said the police were grateful to those who had come forward with possible sightings of Mrs Potter but there were no promising leads at this stage.
Mrs Potter and her husband, Steve, spent eight years campaigning on behalf of Shane Cribb, whose story screened on TV1's I Am Innocent programme last night.
The police officer involved in the crash for which Mr Cribb was convicted in 2005 was later convicted of perjury and sent to prison.