Detectives are continuing investigations into the death of a 19-year-old man at Witham.
Bradley Cockel was found dead at a flat in Bramble Road after police were called to the scene at about 2.25am on Saturday April 27.
A post mortem examination proved inconclusive and further tests are being carried out.
A 19-year-old from Braintree, who was arrested on Sunday in connection with the investigation remains in custody.
Three other men who were arrested on Saturday April 27, have been bailed to dates in May and July.