Key witnesses in the case of a teenage girl murdered 11 years ago are to be re-interviewed by detectives.
The 16-year-old was stabbed more than 40 times in a random killing
No-one has been caught for the murder of 16-year-old Claire Tiltman in an alleyway in Greenhithe in Kent in 1993.
The Dartford Grammar School for Girls pupil had been taking a short cut when she was stabbed more than 40 times.
Now police are re-investigating the case by talking to witnesses and retracing the schoolgirl's last steps using the latest computer technology.
Claire's death remains one of the biggest unsolved murder cases in Kent.
She was the victim of an apparently motiveless killing which left her dying by the side of a main road less than two miles from her house.
Police are trying to trace people who gave evidence at the time of Claire's murder in January 1993.
Anyone with information should contact Kent Police.