A 51-year-old man being questioned over the murder of a man at his East Sussex farm has been released.
No further action will be taken against the man from Robertsbridge over the killing of Julian Gardner at his farm near the village in October last year.
Four men from Kent, aged 22, 29, 32 and 39, who were re-arrested on Wednesday, are still being questioned by police.
A 56-year-old man from Sandhurst and a 41-year-old Ashford man, re-arrested on Tuesday, also remain in custody.
A 17-year-old boy also arrested on Tuesday on suspicion of murder has been released on bail until Friday.
Police believe Mr Gardner, 53, was attacked when he disturbed intruders at Bush Barn Farm, near Robertsbridge, in the early hours of 11 October.
A post-mortem examination found Mr Gardner, who ran an agricultural and car repair business, suffered multiple injuries.
A total of 18 people have been arrested or re-arrested by detectives in connection with the inquiry.
One of those held, a 31-year-old woman from Ashford, has also been told she faces no further action.