The 14-year-old, who cannot be named for legal reasons, appeared at Liverpool Crown Court and pleaded not guilty to murder but admitted a charge of possession of an offensive weapon.

Ava was fatally stabbed on 25 November after visiting the city centre with a group of friends to watch the Christmas lights being turned on.

Shortly after, she was attacked and stabbed in the neck, suffering "catastrophic injuries".

She died at Alder Hey Children's Hospital.

About a dozen members of Ava's family were in court for the hearing, which lasted about half an hour, and some were in tears as the teenager entered his pleas.

Judge Mrs Justice Yip told the defendant: "Your trial is going to take place in May, starting May 9."

The case is expected to last three weeks.

In the wake of Ava's death, hundreds attended a vigil in the city centre and the Radio City tower was lit up blue in memory of the Year 8 student at Notre Dame Catholic College.

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"This strong-willed girl, Ava, was loved by so many people," said the Archbishop of Liverpool as he officiated her funeral.

"Heaven will be a happier place because of her exuberance. She will undoubtedly have taken it by storm."

Three other boys were also arrested following Ava's death.

A Merseyside Police spokesman said a 16-year-old boy was released on bail, a 14-year-old was released under investigation and no further action was taken against a 13-year-old.