Jack Woodley was found severely injured on Saturday, October 17, near The Britannia Inn in Newbottle Street, Houghton.
Jack, who was from the Durham area, died in hospital from his injuries the following evening.
Ten youths, aged between 14 and 17, who cannot be named, have now been charged with his murder.
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Eight of the teens have pleaded not guilty to murder and two have not yet been asked to enter any pleas.
Seven of the youths have also denied manslaughter.
One 15-year-old, who has already pleaded not guilty to murder, today pleaded guilty to manslaughter.
A trial will take place on March 1 and the youths are all remanded to either local authority accommodation or youth detention accommodation.
Judge Paul Sloan QC said that a further pre-trial hearing will take on February 15.