No action will be taken against two men arrested after the discovery of a teenager's body on the Queen's estate.
The men were arrested in connection with the death of Alisa Dmitrijeva, 17, who was found on the Sandringham estate, Norfolk, on New Year's Day.
She had disappeared from her home in Wisbech in August 2011.
Detective chief inspector Jes Fry, from Norfolk Police, said: "All the facts relating to the death of Alisa were submitted to the Crown Prosecution Service for consideration.
"A decision has been made that there is insufficient evidence to prosecute anyone for any offences at this time. Her family have been informed."
Mr Fry added: "This was a complex investigation with many lines of inquiry and I am personally disappointed that we will not be able to offer her family any closure in this case."
The investigation will remain open and any new information that comes to light will be considered, he added.
Miss Dmitrijeva, originally from Latvia and living with her grandmother as she studied at college, was identified using DNA after she was found by a dog walker in a field near the village of Anmer.
It is thought her body had been there since soon after her disappearance and, speaking at the time, Mr Fry said all evidence pointed towards her being murdered.