Officers from Kent and Essex serious crime directorate investigating the death of licensee Joe Daniels, from the Red Cow Pub in Foord Road, Folkestone, Kent, have made an arrest.
A 23-year-old man from Canterbury was arrested on Wednesday 31 January in connection with the incident, which happened inside the pub Wednesday 22 November last year, according to police.
A spokesman for Kent Police said: "On that day, our officers were called to the scene at around 11.30am. Mr Daniels, 58, was found unresponsive shortly before.
"He had suffered an injury consistent with a gunshot wound and was pronounced dead at the scene. A firearm was also recovered."
Last week, Kent Police said they received an "excellent response" to a media appeal and CCTV image of a man believed to have information connected with the death of a pub landlord.
The man arrested remains in police custody as enquiries continue.