A man has been re-arrested on suspicion of the murder of James Attfield in a Colchester park earlier this year.
The 33-year-old was found with more than 100 stab wounds in Castle Park, off Guildford Road, shortly before 6am on Saturday March 29.
Yesterday, an 18-year-old man was arrested in Southend and is currently being questioned by detectives at a police station in Essex.
He was one of seven people arrested in connection with Mr Attfield's killing five days earlier.
The other six people - a 27-year-old woman from Colchester, a 27-year-old man from Colchester, a 57-year-old man from Colchester, a 25-year-old woman from Southend, a 23-year-old woman from Ipswich in Suffolk and a 31-year-old man from Colchester - were later released on police bail pending further enquiries.
Two other men, both aged 33, also remain on police bail until late September pending further enquiries after they were arrested in connection with Mr Attfield's death earlier this summer.
In total, nine people have been arrested as part of the murder investigation.
The funeral of a man, who was murdered in a frenzied knife attack in Colchester, is taking place today.
Jim Attfield was stabbed more than 100 times in the town's Castle Park on March 29.
He'll be buried at St Peters church in Coggeshall this afternoon. But his family say they will only feel closure once his killer has been caught.
Anti-knife campaigners have staged a second march in Colchester's High Street. The parade was led by Caroline Shearer, who set up charity Only Cowards Carry, after her son Jay, 17, from Clacton, was stabbed to death in Colchester in 2012.
Police have renewed appeals for a potential witness to the murder of James Attfield.
Mr Attfield, 33, was found with over 100 stab wounds in Castle Park off Guildford Road shortly before 6am on Saturday, March 29. He died a short time later at the scene.
The man shown in Image 9 on the Essex Police website (www.essex.police.uk) has yet to come forward despite his picture being shown on television, online and in print.
Senior Investigating Officer, DCI Simon Werrett, said: "This man can be seen wearing a hoody and holding a carrier bag as he walks through the park shortly before 1:30am. There has to be someone living in the town who knows this man or is even related to him.
"We urge to them to contact us so that we talk to him and find out what he was doing in the park and then hopefully dismiss him from the enquiry. We want to move on and concentrate fully on potential suspects.”
Anyone with information is asked to call Essex Police on 101 or Crimestoppers anonymously on 0800 555111.
Detectives investigating the murder of a man in Colchester are continuing to eliminate people from their enquiry.
James Attfield was found with over 100 stab wounds in Castle Park off Guildford Road shortly before 6am on Saturday, March 29. He died a short time later.
Following a BBC Crimewatch appeal a large number of people who were recorded on CCTV in the park contacted the incident room to be discounted from the investigation.
Detectives are yet to hear from eight separate men; one female and the man and woman who sat on a park bench possibly opposite James.
DCI Simon Werrett "Crimewatch was a success as it registered with people and got them to contact us so that they could be eliminated from our enquiries. This frees up more capacity for us to scrutinise everything again for clues as to why James was attacked and who is responsible for his murder.”
A man and a woman, both aged 27 and from Colchester, are currently on police bail until Friday, May 9 after having been arrested in connection with the murder.
The mother of murdered teenager Jay Whiston will be handing out leaflets in Colchester today appealing for information to help find the killer of James Attfield.
James was stabbed 102 times in Colchester's Lower Castle Park.
A 38-year-old man arrested at the beginning of the investigation has been released without charge. A 27-year-old woman is on bail until tomorrow morning.
Jay's mother Caroline Shearer set up the charity Only Cowards Carry to help get knives off the streets.
His killer, Edward Redman, was convicted Jay's murder by a jury at Chelmsford Crown Court last week.