Solicitor Alan Collins, who represented 13 of Hall's victims, said: "My clients know what a type of man Hall is and how he operated.
"This additional sentence is further vindication of their decisions to come forward and speak out about the appalling abuse they suffered at his hands."
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A 55-year-old man has died after being shot in front of shoppers in a packed supermarket car park in broad daylight.
The suspect, 35-year-old Willie Corey Godbolt, has been arrested and was being treated for a gunshot wound in hospital.