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A 21-year-old man who was arrested on suspicion of a hit and run has been released without charge.
Folkestone man, Gary Langham, was found in Bower Road, Mersham, with serious head injuries on Sunday, August 23 around 7am.
A young man from the village was arrested on suspicion of dangerous driving just two days later but he has now been released and ruled out of the police inquiry.
Two more men are still on bail after being arrested on suspicion of assault in connection with the incident
Detective Sergeant Matt Smith said 21-year-old man from Ashford and the 22-year-old from Maidstone are still on bail pending enquiries.
Det Sgt Smith said: "I would like to clarify that there is no connection between the young man from Mersham and the two men who were arrested on suspicion of assault."
Mr Langham, who is in his 40s, is still in a critical condition in a London hospital.
The pair arrested for assault are on police bail until Friday, October 16.
Det Sgt Smith added: "Detectives are continuing to investigate this incident, and it is very much an active enquiry.
"I would like to thank those witnesses who have come forward so far, and I would urge anyone else with any information to phone police."
Anyone with information, or who was in the area between 4am and 7am on Sunday 23 August can call Kent Police on 01843 222289 or Kent Crimestoppers on 0800 555111 quoting reference number 23-0342.