A former police officer who led the investigation into the disappearance of Peter Falconio says she is baffled by an anonymous letter that claims the British backpacker’s remains were buried in remote Western Australia.

The letter was reportedly sent to The NT News by an Australian ex-pat now living in London and suggested Mr Falconio’s body was cut up and dumped after his murder.

Police are reviewing the letter to determine whether it warrants further investigation.

Former police officer and lead investigator in the case Colleen Gwynne told 9NEWS the letter is unusual in that it names a potential accomplice. 

"What is unusual is the naming of a potential accomplice, that is quite unusual. It gives police a starting point but information of this nature has trickled through for a number of years now," Ms Gwynne said.

The letter details how Falconio's body was cut up, put into plastic bags and taken to Adelaide then to Perth by train before the remains were buried around Geraldton in Western Australia.

“The theory is a little bit bizarre, why you would take a body over into another jurisdiction to then dispose of it doesn’t make a lot of sense to me, but being an ex-police officer logic is often thrown out the window," Ms Gwynne said.

“My biggest issue is why you would bring it to the media and not the police? So if you wanted to come clean and your conscience got the better of you, you would take it to the Northern Territory police.”

The letter claims to detail how Falconio's body was cut up before being buried.

The letter writer said Murdoch called an associate and told him to meet him the the outback because he needed help to dispose of a body.

"When they met, Murdoch told (the associate) that he had murdered a guy in self-defence. At the time, (the associate) had no idea who the victim was," the letter said.

"Murdoch had cut the body up and put it in two large ... bags that were watertight and smell proof."

The letter said Murdoch ordered the associate to drive to Adelaide and fly to Perth, but he decided to take the train instead thinking the bags would attract less attention.

"(The associate) told me he went way past Geraldton and buried both the bags unopened in a nice spot and even made up a cross," the letter said.

"Later he realised who he had buried and was in a bad way about it."

Bradley John Murdoch is led away by police.

TIMELINE OF PETER FALCONIO'S MURDER

June, 2001 - Peter Falconio and girlfriend Joanne Lees set off from Sydney on the Australian leg of their round-the-world trip.

July 14, 2001 - The pair are driving on a remote stretch of highway north of Alice Springs and pull over when motioned by Bradley Murdoch, who is driving behind them. Ms Lees hears a gunshot behind the car and is then cable-tied but escapes and hides in bushland for five hours.

July 15, 2001 - NT police begin searching for Falconio and his killer, finding a pool of his blood covered with dirt beside the highway.

November 14, 2003 - Murdoch is charged with Falconio's murder.

December 13, 2010 - Forensic testing of bones found in a dam some 80km north of where Falconio was murdered reveal they belong to a large animal.

April 20, 2017 - An anonymous letter claims Falconio's body was cut up, put into plastic bags and buried near Geraldton in Western Australia.

Murdoch was convicted in 2005 of murdering Falconio, 28, and assaulting his girlfriend Joanne Lees on a remote stretch of highway near Barrow Creek, north of Alice Springs, on July 14, 2001.

Falconio and Ms Lees were driving along the Stuart Highway when Murdoch drove up behind them and indicated they should pull over, saying their van might have an engine problem.

Falconio went behind the car with him to investigate, and Ms Lees heard a gunshot, before Murdoch cable-tied her and covered her head.

She escaped and hid in bushland for five hours while Murdoch hunted her with his dog, before she managed to flag down a truck driver.

Murdoch is believed to have hidden Falconio's body, which has never been found despite extensive searches.

© Nine Digital Pty Ltd 2017

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