A man and a woman arrested in connection with the murder of James Attfield have been released without charge.
The pair were on bail in connection with the investigation into the murder on the Riverside Path in Colchester shortly before 6am on Saturday, March 29 last year.
The 19-year-old man and the 23-year-old woman were due to answer bail this week but have been told they no longer have to.
Senior Investigating Officer, Detective Chief Inspector Simon Werrett, said: "The circumstances of James death, the open location he was found, the nature of the forensic and digital evidence, and the information we have uncovered so far mean that this is a complex and involved investigation.
"I remain convinced that the key to solving James' death remains in the Colchester community and I am sure that people still have information that could assist us.
"I remain confident that with the team I have and the assistance of the people of Colchester we will find out who killed James and there are a number of active lines of enquiry that we are still progressing."
James Attfield, also known as Jim, was found seriously injured with more than 100 stab wounds on the Riverside Path in Colchester shortly before 6am on Saturday, March 29 last year. He died a short time later at the scene.
The 33-year-old man from East Bay, Colchester, was last seen in the River Lodge Public House on Middleborough on Friday, March 28.
He left there shortly after 10pm but so far there have been no confirmed sightings of him after that time until he was found dying in the park on the Saturday morning.
Police are asking if anyone has information which could help the investigation to contact the incident room on 01245 282103, Crimestoppers anonymously on 0800 555 111, or email scdappeals@essex.pnn.police.uk.
