A 19-year-old man from Frinton has been arrested on suspicion of murder in connection with an on-going police investigation into the death of Thomas Brittain.
He is currently in police custody awaiting interview by detectives.
Police are continuing to search for Jack Hummerstone, aged 18.
Two men are believed to have entered a property in Charles House in Parkside Quarter off St. Peter's Street in the early hours of Saturday morning armed with a gun and a knife.
They are then thought to have stabbed Thomas Brittain several times.
The 26-year-old, who was staying at the property, died at the scene.