Police spent almost £1million searching for the body of a mum and her three-year-old son who were murdered by her lover over 40 years ago.
Renee MacRae, 36, and her son Andrew disappeared in November 1976 and the pair's remains have never been found.
Last September Renee’s former lover William MacDowell, now 81, was convicted of their murder at the High Court in Inverness and given a life sentence.