Miss Derby was shot at the Summer Jam reggae event last year
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Police are to review their investigation into the murder of a 23-year-old woman at a dance party.
The review comes after Dwane Haughton was found not guilty of shooting Natasha Derby in High Wycombe, Bucks.
The jury unanimously cleared Mr Haughton, 29, of Rhine Close in Reading, Berkshire, of both murder and an alternative charge of manslaughter.
Mr Haughton was found guilty of possessing ammunition without a licence and will be sentenced on Wednesday.
Det Ch Insp Pete Beirne, of Thames Valley Police, said: "We respect the court's decision to return a not guilty verdict on this particular case, which remains active, and we will be reviewing the investigation and do all we can to solve this case."
Miss Derby was shot in the head as the Summer Jam reggae event at the Multi-Racial Centre in High Wycombe, Buckinghamshire, was reaching its climax in the early hours of 4 September last year.
Miss Derby, who had helped to organise the event, was rushed to Wycombe General Hospital and placed on a life support machine which was turned off later that weekend.
Although more than 100 people were packed on to the dance floor at the time of the shooting no-one admitted seeing who fired the shot which killed her.
Police took 115 statements from revellers in the weeks and months after the killing but were unable to trace the killer.
Mr Haughton was arrested in November of last year after his fingerprint was found on a gun cartridge recovered from the scene of the killing.
Mr Haughton always denied firing the fatal shot but admitted having handled a cartridge in a pub earlier that evening when shown it by another man.