New plea on 20th anniversary of Kate Bushell's murder
The killing of 14-year-old Kate Bushell is Devon and Cornwall Police's largest murder inquiry.
The teenager's body was found with her throat cut, close to her home in Exwick on the edge of Exeter on 15 November, 1997.
Police still say they are determined to track down the killer - part of that includes setting up a new incident phone number.
Kate Bushell had been out walking a neighbour's dog. Her body was found by her father when he went looking for her.
The police were told that a man with a blue car had been spotted around the field where her body was recovered.
Witnesses also said that they saw a man running wildly from the corner of the field.
New evidence revealed in the hunt for Kate Bushell's killer
For the first time in the investigation, police have revealed the type of knife used. The actual weapon used to murder the 14-year-old has never been found. Other evidence includes fibres from an orange fabric, which may give a clue as to what the killer had been wearing.
Police are asking anyone whose memory has been triggered from these findings to contact them.
Officers are convinced that someone locally is still withholding vital information.
Tim Bushell, Kate's brother, says the uncertainty of what and why it happened, makes getting closure difficult.
The investigation has involved taking up to 5,000 DNA samples from men in Exeter.
It has also involved 2,000 blue vehicles being traced and eliminated, and 5,000 house-to-house interviews.
The evidence gathered by officers has filled a room at force headquarters in Exeter.
Kate's friends, now grown up, are desperate to find out what happened to her and bring her killer to justice.
Nicky Johns went to school with Kate and says she still thinks about her often. She is backing Devon and Cornwall Police's campaign for people to come forward.
Police are urging anyone with information to get in touch: