The body of a murdered woman found on the Queen's Sandringham estate may be that of a 17-year-old girl who went missing in August, police said.
The remains of a body, discovered on New Year's Day by a dog walker, are believed to have been there for between one and four months.
Police are looking into a number of cold cases nationwide for potential links, including that of missing Latvian-born teenager Alisa Dmitrijeva.
The 17-year-old, from Wisbech, Cambridgeshire, was reported missing by a relative Sept. 6 and was last seen in King's Lynn, Norfolk, 10 miles from the royal retreat, on Aug. 31.
A £5,000 reward has been offered for information which would help find the missing teenager.
"How far back this investigation goes depends on what the experts say. We are looking at missing persons reports nationwide as well as cases we have been working on more locally for potential links," said Detective Inspector Jes Fry.
While a murder inquiry has been set up, it is not clear whether the woman was killed at the scene or taken there after her death.
"The pathologist believes it is highly unlikely the death was through natural causes. There is no evidence of accidental injury, damage due to firearms or bladed weapon," said a Norfolk Police spokesman.
"Samples have been taken which should provide a DNA profile."
Detectives have not said whether the body was fully clothed.