The family of murdered schoolgirl Megan Leigh-Peat issued a statement read by police outside Luton Crown Court.
Andrew Hall - a former scholar at Stoke City's football academy - was found guilty of her murder. He will serve a minimum of ten years in prison.
Hall stabbed Megan 60 times with two different knives following an argument about his jealousy.
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The Birmingham singer's dream ended when she lost out to girl group Four of Diamonds in Sunday's sing-off.
"Street cruising in the city has escalated recently posing a real threat to innocent, law-abiding motorists and pedestrians."
It will be a grey start to Monday with patchy rain and drizzle moving in from the south.