The mother of a missing teenager believes a bone found near Badgingarra could be human remains.

Margaret Dodd's 17-year-old daughter Hayley vanished in 1999 after she hitched a ride from Dongara, where she was working as a roustabout.

She was last seen walking along North West Road near Badgingarra.

In desperation, her family hired a cadaver dog to search for her body in June last year and despite nothing being found at the time, the dog identified a location.

The bone, dug up at the Badgingarra site on Friday, was handed it in to Moora police.

Sergeant Phil Cartledge said the piece of bone was immediately transferred to State Pathology which will determine if the bone is part of human remains.

The special crime unit will continue with their enquiries.

"At this stage the Moora police are not involved in the enquiries," Sergeant Cartledge said.

There have since been reports of police confirmation that the bone found is from a sheep but Mrs Dodd said she was still hopeful the bone might be Hayley's.

Mrs Dodd said she was mistrustful of police and would not believe the bone was from a sheep until she receives the forensic report and a report from an anthropologist.

"As soon as the police saw the bone they just said, 'No, it's a sheep's'," Mrs Dodd said.

"One of the searchers said the bone he found didn't look anything like a sheep's, according to a chart he had, and another one of the searchers' uncle is a butcher."

"They sent him a photo of the bone and he said it wasn't a sheep's bone."

Mrs Dodd said she had investigated her daughter's disappearance after "disgusting" treatment from the police and a lack of help.

Convicted rapist Francis Wark found guilty of murdering missing teenager Hayley Dodd

Updated 

A convicted rapist has been found guilty of murdering missing 17-year-old Hayley Dodd, more than 18 years after the girl vanished while walking along a remote road in Western Australia's Wheatbelt region.

Francis John Wark, 61, was found to have lured the teenager into the borrowed ute he was driving on July 29, 1999, and killed her in the course of a sexual assault.

Wark owned a property in Badgingarra, near where Hayley was last seen walking along North West Road.

Her body has never been found and her family and friends never heard from her again.

Many of them packed the Supreme Court for Monday's verdict, some wearing yellow flowers to honour Hayley and all other missing people in Australia.

They all sat silently as Justice Lindy Jenkins delivered her guilty verdict.

In her 200-page decision, Justice Jenkins said it was a "sad but inescapable" conclusion that Hayley was dead and that Wark was responsible.

"I am satisfied beyond a reasonable doubt that the accused [Wark] picked up Ms Dodd and killed her on 29 July, 1999 by some unknown means," Justice Jenkins said.

Wark was not charged with Hayley's murder until 2015, when he was serving a 12-year jail term in Queensland for physically and sexually assaulting a 31-year-old woman he had picked up on a remote road in the state's north.

Justice Jenkins, who presided over Wark's seven-week trial last year, said based on evidence about the Queensland crime she was satisfied Wark had "a propensity to pick up a lone female hitchhiker and to violently and seriously assault her so that she could not resist his sexual assault".

Single earring the vital clue

A crucial piece of evidence during his trial was the discovery, during a 2013 cold case review, of a single earring embedded in the fabric of a car seat cover seized from the ute in 1999.

The earring matched drawings done by Hayley's friend, of earrings she had bought two days before she vanished, and was believed to have been wearing when she was last seen alive.

Wark's laywer Darryl Ryan had suggested the earring may have been planted by police, who were under pressure to solve the crime, or that it could have come from someone else who had been in ute before Hayley's disappearance.

However Justice Jenkins rejected both of those submissions.

"It is not a reasonable possibility that the earring found on the seat cover was left there prior to 29 July, 1999, or that it belonged to anyone other than Ms Dodd," Justice Jenkins said.

Wark's trial was also told that during his Queensland crime, he had demanded the victim give him an earring, telling her "I want to keep it."

Justice Jenkins said that evidence along with the discovery of Hayley's earring led her to find "the accused [Wark] is a person who would be likely to take an earring as a trophy from his victim".

Another vital piece of evidence at Wark's trial was the DNA analysis of a single 18-millimetre strand of hair, found during the cold case review, in the debris taken from the ute.

Mr Ryan had highlighted that male DNA was also found on it, meaning there was a possibility it had not come from Hayley.

Justice Jenkins appeared to agree, finding that while it was possible it was Hayley's hair, she was "not persuaded" that it was.

Prosecutors had argued Wark should be guilty of wilful murder arguing he intended to kill Hayley, but Justice Jenkins said she was not satisfied beyond a reasonable doubt that was the case.

"That is because I find that it is a reasonable inference to draw from the evidence that the accused picked up Ms Dodd in order to sexually assault her and that he killed in the prosecution of that unlawful purpose, without necessarily forming an intention to kill her," Justice Jenkins said.

The crime of wilful murder no longer exists in Western Australia, but Wark was tried under the laws that were current in 1999, when wilful murder was still distinguished from the crime of murder.

Wark has always denied anything to do with Hayley's disappearance, claiming that at the time he was doing his weekly "ritual" of shopping in Moora, about 50 kilometres away from Badgingarra.

Justice Jenkins said while the timeframe of the murder was "extremely tight", Wark did have "the opportunity" to "encounter" Hayley on his journey back to his property, murder her and dispose of her body.

Wark will face a sentencing hearing next week, to allow Justice Jenkins to determine what minimum term he should serve before being considered for release on parole.

Family still searching for body

Margaret Dodd campaigned for 18 years to get justice for her daughter and her family, but was too upset after the verdict to comment.

Hayley's sister Toni Dodd said the family did not think this day would ever come, but they now wanted Wark to tell them where Hayley's body was.

"Tell us where Hayley is so we can put her to rest. Give our family some peace."

"We didn't just lose a sister, we lost parents as well," Ms Dodd said.

She said the family would always support changes to the law so that killers who do not reveal the location of their victims' bodies do not get parole.

Ms Dodd said it had been "horrible" sitting through the seven-week trial last year.

"We had to sit through it to know every detail," Ms Dodd said.

"We want to know what's happened, to try to figure out why, try to figure out if there are any clues as to where she is and why did he do it."

Heartbreak in futile psychic search for murdered teen Hayley Dodd

 
Emily Baker7News Perth
 

The mother of murdered teen Hayley Dodd has vowed to rethink future searches for her daughter's remains after a site identified by a psychic failed to deliver clues to her final resting place.

The psychic believed 17-year-old Hayley's body was buried five kilometres away from her killer's home, off a quiet stretch of road in Badgingarra.

Margaret Dodd says specially-trained dogs had also picked up a scent in the area.

Her grandchildren even helped dig for an aunty they never met and machinery was brought in to progress the search.

"This spot has come up time and time again basically because this woman truly believes Hayley is there," Mrs Dodd said.

"What choice did we have, we started digging."

Hayley went missing while hitchhiking to a farm in Badgingarra in 1999.

Francis John Wark was convicted of her murder, but won't reveal where Hayley's body is.

The latest search drew a blank and Mrs Dodd has vowed not to undertake another because of the heartbreak it had caused her family.

The only exception would be if Hayley's killer reveals where she is buried.

"It put me really really down, it's messed around with my daughter's head," she said