James Attfield Colchester murder: Reward increased to £10,000
A reward for information over the death of a 33-year-old man killed in a "frenzied" knife attack in an Essex park has been doubled to £10,000.
James Attfield, of East Bay, Colchester, was found dead in the town's Castle Park on 29 March.
Police have revealed they now hold more than 4,300 items of "intelligence on file" in relation to the murder.
The "vulnerable man", who had a brain injury, had been stabbed more than 100 times.
Mr Attfield was last seen at the town's River Lodge pub on 28 March.
Det Insp Anne Cameron said: "James was a vulnerable man who would not have been able to run away from his attacker. For the sake of his family we will do all we can to bring his killer to justice."
To date, detectives have taken more than 800 statements and say more than 230 people have phoned them in response to appeals. They are still looking for seven people to contact them captured on CCTV in the area.
Mrs Cameron added: "If you recognise yourself from the CCTV please contact us, even if you did not see or hear anything as we need to identify everyone so that we can move forward with our inquiries."
Police have said they cannot rule out a possible link between the murder of Mr Attfield and that of Saudi Arabian student Nahid Almanea, who was found with 16 stab wounds on a Colchester path on 17 June.
Ann Scott, from Crimestoppers, which is funding the reward, said: "It is natural to feel nervous about what has happened in Colchester, and this is why we are increasing the reward for information on the murder of James Attfield."