The court heard Sharp had a string of previous convictions for sexual offences, beginning when he was just 16 and he harboured perverted sexual fantasies involving the gagging, raping and murdering of women - which he acted out on Miss Gowing.
And just hours before the murder he left another woman tied to a bed after she refused to take part in perverted sexual acts, Mold Crown Court heard.
You are, on any view, a very serious danger to women.
The judge said Sharp broke into Miss Gowing's house in the middle of the night, tied her to the bed and kept her prisoner while she was raped repeatedly and sexually abused.
Then, in a further "callous act", he cut up her body and disposed of her in various places along the River Dee.
More top news
Eight of those who were on board have been found by a search and rescue operation, the 7th fleet said.
The US president questioned why it took the Alabama Republican candidate's accusers 40 years to come forward.
Wigan footballer Ryan Colclough scored twice on Tuesday night before being substituted and rushing to hospital for the birth of his son.