Detectives investigating the murder of a Cornish parish councillor want help to build up a picture of his lifestyle.
Detectives are still trying to identify the person called "Charlie"
Officers say they are very surprised that not many of Peter Solheim's acquaintances have come forward.
The body of Mr Solheim, 56, who was a parish councillor, was recovered from the sea by fishermen five miles off the Lizard on 18 June.
Det Insp Neil Best, who is leading the murder inquiry, says they need to know what sort of man Mr Solheim was.
He believes there could be vital clues in his background which could help with the inquiry.
The officer said: "I feel there must be people who know him through links with sailing or when he was a councillor, or any other social or business contacts.
"We need to know and understand what Peter Solheim was about.
Mr Solheim, from Carnkie, was last seen getting into his small white dinghy with an unidentified man at Mylor harbour, near Falmouth, on 16 June.
The man was described as white, well built and aged 50 to 55, with dark brown hair, and wearing a leaf green jacket, which was hip or thigh length.
The following day Mr Solheim's boat, the Izzwizz, was found adrift in the harbour, with the key in the ignition. His body was found with unexplained injuries the day after that.
The body was recovered five miles off The Lizard Peninsula
Police say Mr Solheim was reported to be interested in the occult.
Inquiries are continuing to identify the person called "Charlie" who Mr Solheim was believed to have been meeting.
Officers have not ruled out the possibility that the two men may have left from another harbour along the coast.
Police would also like to eliminate a green estate car, similar to that owned by Mr Solheim, which was seen by a witness parked at the Mylor Churchtown side of the crossroads near Trefusis Farm, at about 2130 BST on 18 June.
Det Insp Best said: "There is always a chance that someone, particularly a member of the sailing fraternity, is visiting the area for the first time since June and hasn't seen the previous appeals.
"If that is the case, we would ask them to contact us."
A 56-year-old local woman from the Falmouth area was arrested on 21 July in connection with the inquiry, but later released on police bail.