Peter Solheim's body was found floating five miles off-shore
Police investigating the murder of a 56-year-old Cornish man whose body was found by fishermen five years ago are following up new lines of inquiry.
The mutilated body of Peter Solheim, a parish councillor from Carnkie, was found five miles off-shore in 2004.
His ex-lover, Margaret James, 58, from Porthoustock, was found guilty of conspiring to murder him and jailed for 20 years in 2006.
Police say they believe other people were involved in Mr Solheim's murder.
A reward offered by Crimestoppers for any information leading to the arrest and conviction of anyone responsible for his murder has been doubled to £10,000.
Mr Solheim's body was found floating in the sea south east of Black Head, on the Lizard, on 18 June 2004. He had last been seen alive two days earlier .
The father-of-two, who was a pagan and member of the druid community, had been drugged and mutilated with a machete or axe before he died from drowning.
During an 11 week trial at Truro Crown Court the prosecution said that Margaret James, who had embarked on a nine year relationship with Mr Solheim after meeting through a lonely hearts column, feared he was about to leave her.
A spokesman for Devon and Cornwall Police said that several new leads had been identified following a detailed review of the evidence which would be investigated over the coming weeks.
Detective Inspector Stuart Ellis said: "It has always been our case that there were other people involved in the murder of Mr Solheim and they have not yet been brought to justice.
"There are still unresolved issues in this case and, following a review of all the evidence, we are actively pursuing positive new lines of enquiry.
"We are very keen to speak to anyone who may be able to help us with this investigation either directly or through Crimestoppers in the strictest confidence."