The family of an animal rights campaigner from Cornwall who was shot dead in the Caribbean say they are disappointed there has been no progress in the case.
Jane Tipson: Shot dead in car
Jane Tipson, 53, from Wadebridge in Cornwall, was murdered in her car in St Lucia in September.
Three local men were arrested shortly afterwards, but no-one has been charged.
Ms Tipson's sister, Barbara, who lived with her sister on the island, said: "The police have been fantastic, they have told us everything that they are doing, but they have limited resources."
Forensic assistance has been brought in from the FBI.
Ms Tipson had strong views on environmental issues and campaigned against the St Lucian government's support of commercial whaling.
She also opposed the development of "swimming with dolphins" centres.
But her sister felt that environmental campaigning was not connected with her death.
She said: "Although she did not take any nonsense from anyone, she was a very caring person and had many friends on the island.
"She knew there was no point in shouting and screaming over environmental issues.
"A lot of adversaries on controversial issues such as whaling were at her funeral."
The Foreign Office said it had been in regular contact with her relatives.