William MacDowell, 80, was convicted by a jury at the High Court at Inverness of killing both Renee MacRae and their infant son Andrew in November 1976.
A married man who murdered his lover and their young son more than 45 years ago has been sentenced to life in prison, ending one of the longest unsolved murder cases in Scottish criminal history.
The road to justice for Renee MacRae, 36, and Andrew, her baby, has been long and painful, with police at one point turning to the services of a Swiss clairvoyant.