Detectives investigating the murder of James Attfield have identified another person pictured on CCTV on the night of the crime.
Mr Attfield, 33, was found with more than 100 stab wounds in Castle Park in the early hours of March 29.
As part of the murder investigation, Essex Police issued 22 CCTV images showing people walking through the park the same night.
Officers have now identified all but seven people.
A man and a woman, both aged 27 and from Colchester, are currently on police bail until May 21 after having been arrested in connection with the murder.