Logan MacPhail, then aged 16, stalked Holly Newton for an hour through Hexham, Northumberland, before knifing her 36 times in an alleyway.
CCTV showed him wearing a snood and a baseball cap and ducking out of sight as he followed Holly and her friends around the town centre.
He also stabbed a teenage boy who intervened to try to stop the attack, which was so savage that the weapon broke and the blade snapped.
MacPhail was convicted of murder following a trial at Newcastle Crown Court in August and sentenced at the same court yesterday.
Last month the judge lifted a reporting restriction which had prevented the media from identifying him due to his age.
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