A reward of £50,000 has been offered for anyone who can come forward with information to solve a murder case from 1984.
Lisa Hession, 14, was found sexually attacked and strangled 500 yards from her home in Leigh, Greater Manchester.
New leads emerged in 2005 but her killer is still yet to be caught.
Greater Manchester Police say the reward would be paid for information leading to the arrest and conviction of the killer.
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