Ms Gowing's body has never been fully recovered, although remains were found at two rural locations near her home in Flintshire, North Wales, and near Chester.
Clive Sharp, 47, of no fixed address, pleaded guilty to her murder at Mold Crown Court last month.
Mr Justice Griffith Williams ordered that he serve a minimum 37 years behind bars before he can be considered for parole.
More top news
Once again low pressure drives our weather today with an active weather front bringing very windy and very wet conditions.
A young polar bear has won the affections of the internet after a video of her growing up was watching hundreds of thousands of times.
Twenty-one-year-old pair raise nearly £40,000 in the world's toughest row.