25-year-old Paul Wallington died in hospital five days after being assaulted outside the Vine Bar on the High Street on Christmas Eve.
Paul Wallington
So far, officers have spoken to more than 20 witnesses but need to trace two men who may have seen what happened.
One of the men is described as wearing a grey hooded top and blue jeans, and had a distinctive dark-coloured hospital boot on his lower right leg.
The other man is described as wearing a green top and dark jeans.
A 29 year-old man has been arrested on suspicion of murder in connection with the incident and is currently on bail until Monday, 25 March.
Anyone who recognises the men is asked to contact police on 101 with the crime reference number 42/188854/18 or email scd.appeals.essex@essex.pnn.police.uk.
