Detectives investigating the murder of James Attfield are renewing their appeal for a man and woman to come forward.
Crimestoppers is offering a reward of up to £5,000 for information on the violent murder of a man from Colchester.
Essex Police have issued 21 CCTV images of people who might be vital witnesses in an inquiry into an horrific stabbing.
A jury has retired to consider its verdict on the man accused of fatally stabbing Jay Whiston at a party in Colchester.
Edward Redman, 18, of Wayland Drive, Colchester, denies murder.
Essex Police have today renewed their appeal for help to track down the killer of a man who was stabbed to death in a Colchester park.
A 38-year-old who was arrested in connection with the killing of 33-year-old James Attfield has been released without charge.
Watch Kate Prout's report.
A 38-year-old man who was arrested by police in connection with the killing of a vulnerable father-of-five in Colchester has been released without charge.
James Attfield, 33, was found stabbed to death in Lower Castle Park last weekend. He had more than 100 knife wounds.
DCI Simon Werrett, of Essex Police, said: "This is very much an active investigation and we still need information to find the person or people responsible for James’ murder.
"James was a vulnerable man who would actively avoid confrontation and risky situations. I cannot see any reason why someone would want to attack him.
"A mother has been robbed of her son, his siblings of their brother and his children of their father.
"I am determined to ensure that James’ family are able to see justice done and whoever is responsible for James’ violent murder is taken off the streets.”
Police have arrested a 38-year-old man from Colchester in connection with the investigation into the murder of James Attfield.
Mr Attfield was struck down in Castle Park on Saturday morning - he had suffered more than 100 knife wounds.
A man was arrested in Cowdray Avenue this afternoon and has been taken to a police station for questioning.
"I'd urge members of the public to continue to call my team with any information they might have about the whereabouts of James Attfield or anything they may have seen or heard in the Castle Park area during the early hours of Saturday morning, Senior Investigating Officer DCI Simon Werrett said.
"This is very much a fast moving and on-going investigation which really needs information from the public.”
Police in Colchester have widened their hunt for the weapon used in a frenzied attack on a vulnerable man.
James Attfield, 33, from East Bay in Colchester, was struck down in Lower Castle Park early on Saturday morning - he suffered 102 knife wounds before he died.
Detectives are still struggling to find a motive for the attack.
Click below to watch a report from ITV News Anglia's Victoria Lampard.
Essex Police are looking to identify a man they want to speak to in connection with an ongoing rape investigation in Chelmsford.
A 24-year-old woman was assaulted in her home by a man she met at Candy Club in the town centre in the early hours of New Year’s Day Wednesday, January 1. The man then raped her and stole several of her belongings before leaving.
Investigating Officer, Dc Karen Hutchings, said: "We are still trying to find the man who raped this woman. After looking through the nightclub CCTV and we have not been able to find any relevant, helpful footage.
"However, there was a photographer on duty inside the club and he has given us some photographs of men who were inside. We don’t know if this man is the one pictured or whether he was a reveller and so therefore a potential witness; either way, we would like to identify him and speak to him.
"We ask him and those who know him to contact us.”
Anyone with information in connection with this rape is urged to contact detectives at Colchester’s Sexual Offences Investigation Team on 101, Crimestoppers anonymously on 0800 555111 or email the incident room SOIT@essex.pnn.police.uk