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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A large tent has been put up around the area while investigations continue.