Missing Strabane woman Mrs Attracta Harron may have been suffering from memory loss when she disappeared, her son said today.
Mrs Harron (65) vanished after attending mass in Lifford, Co Donegal, last month.
It has been claimed that a man offered two women lifts on separate occasions on the Lifford road in Strabane before she vanished.
Mrs Harron was on medication for blood pressure when she disappeared. Her son Micheal said today he was convinced she was still somewhere in Ireland.
He added: "She may have been in a rush and might have had a loss of memory, although she never had that problem before.
"Her blood pressure was slightly high and she had started taking medication. We think she may have had some medication with her, but not the full amount."
Mrs Harron, a retired librarian disappeared on December 11th. A few weeks later a witness came forward to gardaí claiming to have seen someone answering her description wandering Dublin.
Her family spent Christmas Day handing out leaflets in Dublin.
On New Year's Eve it was disclosed that two women had come forward to claim a man had offered them lifts on two occasions on the Lifford road two weeks before Mrs Harron's disappearance.
The man was described as having a southern accent and was driving a grey car. Detectives investigating the disappearance described it as an unusual development that could be relevant to the inquiry.
PA