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Murdered mother-of-two Yvonne Walsh was a warm and loving person who was "absolutely devoted to her two young children".
Wesley Williams was jailed for a minimum of 29 years for the murders of Ms Walsh, 25, and her seven-month-old son Harrison.
The bodies of the mother-of-two - whose other child was staying with relatives - and Harrison were found on June 2 after police forced entry to their home.
Detective Chief Inspector Sarbjit Johal, from the homicide investigation team, described Williams' actions as "shocking and senseless".
Speaking outside court, the officer said: "Yvonne's family described her as a warm and loving person who was a dedicated professional and absolutely devoted to her two young children.
"My thoughts are with their family, friends and the community that they lived in who are all still struggling to come to terms with their deaths."
Wesley Williams behaved as if nothing had happened after murdering his ex-partner and her son, a court has heard.
Yvonne Walsh, 25, and her seven-month-old son Harrison were found dead in separate rooms with the curtains drawn at their home in Birmingham in May this year.
Mr Justice MacDuff said Williams' subsequent behaviour, which included posting messages on Ms Walsh's Facebook page and visiting friends, demonstrated how unconcerned he was at what he had done.
The judge told a completely impassive Williams:
A man sentenced to life for murdering his ex-partner and her seven-month-old son was previously in a relationship with a woman who also killed her son, it has been revealed.
Details of Wesley Williams' previous relationship with Rebecca Shuttleworth, who was jailed for life in June for the murder of son Keanu Williams, could not be reported by the media until today after a court order was lifted by the judge.
Wesley Williams killed Yvonne Walsh and her seven-month-old son out of anger after she ended their relationship as he planned to propose to her.
Police found that Williams made comments on Facebook almost immediately after the murders.
In a post to his own Facebook account timed at 8.54pm on Friday May 31, Williams wrote: "Sometimes we just have to do things we shouldn't."
Inquiries by police also proved that Williams told another social media user he was in good spirits, and had then posted "I am sorry it had to come to this" on Ms Walsh's Facebook page.
The 29-year-old cannabis user was also captured on CCTV doing "high-fives" with a friend in a fast-food outlet in the hours before he was arrested by police.
Friends of Williams also told police he had seemed fine after May 31 and was "joking, laughing and smiling" as he played pool on a computer.
A man who killed his ex-partner and her seven-month-old son has been described as being "clearly evil and dangerous beyond measure".
Wesley Williams used a ligature to carry out the "chilling, casual and calculated" killings of Yvonne and Harrison Walsh, who were found dead in their beds in June.
Jailing Williams for a minimum of 29 years at Birmingham Crown Court, Mr Justice MacDuff described the 29-year-old cannabis user as being "clearly evil and dangerous beyond measure".
A man from Birmingham has been sentenced to life in prison, with a minimum of 29 years before he can be considered for release.
Wesley Williams, 29, strangled his ex-girlfriend Yvonne Walsh and her baby son Harrison in June.
Wesley Williams was today jailed at Birmingham Crown Court for a minimum of 29 years for the murders of his ex-partner and her seven-month-old son.