Police investigating the murder of Saudi Arabian student Nahid Almanea in Colchester have released an e-fit of a man they would like to speak to in connection with the incident.
Essex Police said the man is white, aged between 18 and 25, of medium build and has dark hair, was wearing a red hooded top and dark trousers. He also has a piercing in his left eyebrow.
Witnesses said they saw a man on the morning of the attack running up Hewes Close, away from the Salary Brook Trail where Almanea was murdered.
The man in the e-fit is one of 11 people who police are trying to identify who may have been on or near the scene at the time.
Almanea, 31, described as an "exceptional" English language student at the University of Essex, died after being stabbed 16 times on 17 June.
Crimestoppers is offering a £10,000 reward to anyone who can give information which will lead to the arrest and conviction of whoever is responsible for the murder.
Officers are also investigating if there is a link between her killing and that of 33-year-old James Attfield, who was stabbed more than 100 times in a "frenzied" attack in nearby Colchester Castle Park in March.
Chief insp Richard Phillibrown, Colchester district commander, said: "We have received excellent support throughout this investigation from the whole community.
"We appreciate their patience whilst the forensic searches continue. We would also urge anyone with information, no matter how small you might think, to contact us."
Anyone with information should contact the police force on 01245 282103 or Crimestoppers anonymously on 0800 555 111.