The 33-year-old was jailed for a minimum of 17-and-a-half years after he admitted murder in July last year.
Liverpool Crown Court was told Hawke, of no fixed abode, moved into Sharon's house after just one date, and started controlling the 39-year-old, who suffered from depression and had learning difficulties.
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Just three days later, on July 13, 2014, police found her dead in her flat in Liverpool.
And now Stephan, from Wirral, Merseyside, is determined that his sister's death will not in vain.
He told how his sibling suffered more than 90 injuries, including being stabbed in the liver, spleen, lungs and heart with a four-and-a-half inch knife.
After stabbing Sharon, Hawke had a beer before calling the police.