A fifth man has been arrested on suspicion of murdering businessman Julian Gardner at his East Sussex farm.
Sussex Police said a 56-year-old man from Ashford in Kent, handed himself in to officers in Eastbourne on Monday and was currently being questioned.
Mr Gardner, 53, died on 11 October from multiple injuries after apparently disturbing thieves in outbuildings at his Robertsbridge farm.
Four other men all from the Ashford area have been arrested over his death.
They have all been released on bail.
Police said two addresses in Kent were searched on Friday.
A Sussex Police spokeswoman said: "Detectives investigating the murder of Julian Gardner have arrested a fifth man in relation to his death.
"A 56-year-old man from Ashford, Kent, presented himself at Eastbourne custody centre today and has been arrested for murder.
"He is currently being interviewed in relation to the death of Julian Gardner."
Police believe Mr Gardner was the victim of a botched robbery at Bush Barn Farm where he ran an agricultural and car repair business.
One theory is that he was crushed between two vehicles.
Mr Gardner's body was found by his business partner. He had suffered several fractures and compression injuries.
Two burnt-out vehicles were found abandoned a few miles away.