Johnson, who is now 77 years old, disappeared from her home in Surrey, British Columbia, in September 1961 and was never found, despite a police missing persons investigation – and even a murder probe into her husband.
Marvin Johnson, who died in the late 1990s, was suspected of killing Mrs Johnson and disposing of her body in their back garden, which was fully excavated during the investigation.
However, the case was dropped when no evidence could be found and the missing persons trail went cold.
In a remarkable twist, Mrs Johnson – who now has a lot of explaining to do – was discovered after her daughter Linda placed an advert in a local newspaper and the mysterious case of her disappearance was highlighted by Canadian police more than half a century on.
Linda then received a call from another mystery women, claiming to be her step-sister, telling her that her mother was living in the Yukon, with a whole new family.
It still remains unclear what prompted Mrs Johnson to up and leave without a word.
‘The wheels were set in motion and it led to finding Lucy Johnson alive and well,’ said Royal Canadian Mounted Police corporal Bert Paquet.
‘It’s a life-changing event. She’s certainly got some explaining to do to her family.’