Pamela Jackson went missing at the beginning of March and police have since charged the 55-year-old's partner Adrian Muir with her murder, although no body has been found.
Her family have been continuing to appeal for any information that might help find their elder sister.
You can watch the full report form our correspondent Gregg Easteal below..
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Sandiford, a former legal secretary originally from Redcar, was convicted of drug smuggling offences and sentenced to death in 2013.