A teenager killed an 11-month-old baby because he resented the way she got in the way of his relationship with her mother.
Mitchell Cooper, 17, swung Ruby Spink against a wall in a jealous rage, then calmly called paramedics and claimed she had choked on a piece of cake.
The infant died the same day in hospital - two months after social services began 'closely monitoring' her following a tip-off and six days after she was placed on an at-risk register.
A post mortem revealed she had suffered broken legs and ribs in the weeks before her death and had been shaken violently.
Ruby's natural father, Martin Shabangu, yesterday accused social services of failing her as Cooper - who denied murder - was jailed for life and ordered to serve at least 12 years.
The baby's mother, 18-year-old Laura Spink, was sent to a young offenders' institution for 12 months after admitting neglect.
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