On an October morning in 1978, three young travelers
left a caravan park outside Mount Isa in a stranger’s vehicle. Their
motorcycles, camping equipment and a nine-month-old Doberman puppy remained
behind.
The journey was supposedly a short outing. But the
three friends never returned.
That evening, the same vehicle was reportedly seen
back at the campsite. The driver was alone. He called repeatedly for the puppy
by name while gathering the travelers’ belongings.
Less than three weeks later, three bodies were
discovered in the surrounding bushland. Each victim had been shot in the head.
For decades, investigators struggled to establish
exactly what had happened to Karen
Edwards, Tim Thompson and Gordon Twaddle. One man eventually
became the focus of the investigation. He was arrested in 2019 and charged with
three murders, only for prosecutors to withdraw the charges four years later.
The man had also spent years working as a senior
officer inside one of Australia's most secure prisons.
Now, a renewed Queensland
cold case investigation and a reopened coronial inquest have
brought the circumstances of the 1978 killings back into public view. Yet the
central question remains unanswered: who murdered the three travelers, and what
happened during their final hours?
Three friends set out on a journey
across Australia
The story began on October 2, 1978, when three young
travelers left Alice Springs on two motorcycles.
Karen Edwards was 23 and came from Dandenong,
Victoria. She was training in medical psychology and had traveled north to meet
her boyfriend, Tim Thompson, after months apart.
Tim, 31, was originally from New Zealand. He had
moved to the Northern Territory the previous year to teach at Hermannsburg, a
remote Aboriginal community near Alice Springs.
Their companion, Gordon Twaddle, was 21. A New
Zealander and pastry cook, he was a family friend of Tim's and shared the
couple's enthusiasm for motorcycling.
They were also traveling with Tristie, a
nine-month-old Doberman puppy.
Tim and Karen rode a red-and-gold 1977 BMW motorcycle
fitted with a homemade sidecar. The sidecar carried their dog and much of their
luggage. Gordon rode a blue 1977 Suzuki with a racing-style cowling.
Their intended route was ambitious. They planned to
travel north and east to Mount Isa, continue toward Cairns, and then follow
Australia's eastern coastline south to Melbourne.
They hoped to arrive home in time for Christmas.
The first part of the journey appeared uneventful.
They stopped at Aileron and spent a night camping at Tea Tree in the Northern
Territory. A tourist even photographed the three travelers during their trip.
That photograph would later become an important
reminder of the people who disappeared.
The roads ahead crossed some of the most isolated
parts of Australia. Settlements were separated by long stretches of open
country, and travelers could drive for hours without encountering another home.
On October 4, the group reached Mount Isa in
northwestern Queensland.
By the following morning, they were staying at
Moondarra Caravan Park, approximately 12 miles north of town. The reservoir
nearby attracted tourists, backpackers, fishermen and people traveling through
the Outback.
Nobody at the campsite had reason to believe that the
group's journey was about to end in tragedy.
The stranger in the brown-and-white
Land Cruiser
Witnesses later told investigators that the three
travelers had been seen with another man at the caravan park on the morning of
October 5.
He was described as dark-haired and bearded. He drove
a brown-and-white Toyota Land Cruiser station wagon and had reportedly
encountered the group earlier during their travels.
At some point that morning, Karen, Tim and Gordon
climbed into his vehicle.
Their motorcycles remained at the campsite. Their
camping equipment was left behind, and Tristie was tied to a tree.
The witnesses understood that the three friends were
going on a short outing. There was no obvious indication that they were leaving
permanently or abandoning their belongings.
But they never returned.
Later that day, the Land Cruiser reportedly came
back. The driver was alone.
Witnesses recalled hearing him call the puppy by its
name as he gathered the group's possessions.
By the following morning, the evidence left behind
was even more disturbing.
Workers arriving at Mount Isa's town rubbish tip
discovered Tristie alive. Nearby, the travelers' helmets, jackets, gloves and
tents had been placed inside a 44-gallon drum.
Gordon's blue Suzuki was later found abandoned at a
service station in town, with its keys still in the ignition.
Tim's red BMW, however, had disappeared.
At first, the absence of the travelers did not
immediately trigger alarm among their families. Long periods without
communication were not unusual when people were crossing remote parts of
Australia.
Their relatives in Victoria and New Zealand expected
another postcard or telephone call when the group reached its next destination.
They had no idea that the three friends were already
dead.
Three bodies discovered in the
bush
On the evening of October 24, Mount Isa resident Stan
Harris was walking his greyhounds through bushland near Spear Creek,
approximately eight miles north of town.
In the long grass beside a tree, he discovered a
decomposing body.
The man had been shot once in the head with a
small-caliber rifle.
Police searching the area the following morning
discovered two more bodies in nearby spinifex. They were approximately 100
yards from the first victim.
All three had suffered gunshot wounds to the head.
The bodies had been in the bush for close to three
weeks, and the Outback conditions had made identification difficult.
Investigators initially faced a devastating problem:
they had three murder victims but could not immediately establish their
identities.
The post-mortem examinations indicated that the
deaths had occurred around October 5, the same day the travelers had
disappeared from Moondarra Caravan Park.
The victims' pockets had been turned inside out.
Wallets, watches, jewelry and other identifying possessions were missing.
The circumstances suggested that someone had
deliberately removed items that could help identify the victims.
Then investigators found something that would
eventually connect the remains to one of the missing travelers.
A tiny watch helped identify the
victims
Among the grass was a small woman's wristwatch.
Its band was broken, but markings inside the case
provided investigators with a possible lead. The inscriptions, recorded as
MG8/78OH, were associated with a jeweler's marking from earlier that year.
Police circulated photographs of the watch and its
identifying details through newspapers across Australia.
They hoped someone would recognize it.
That person was Karen's father, Jack Edwards.
He recognized the watch as belonging to his daughter.
Dental records subsequently confirmed Karen's identity, while fingerprint
evidence identified Tim and Gordon.
By early November 1978, the three bodies had finally
been given names.
For their families, however, identification was only
the beginning of another painful chapter. They still had no explanation for why
the friends had been killed, who had taken them from the caravan park or where
their missing possessions had gone.
The investigation was also affected by an
extraordinary accident.
While police were working in the area, a helicopter
conducting an aerial survey crashed nearby. Several officers aboard were
seriously injured, and resources had to be redirected to the emergency.
The murder investigation had already been complicated
by the remote location and the condition of the bodies. The helicopter crash
added another setback.
Why the original investigation
struggled
Detectives believed the killer might have been
familiar with Mount Isa and its surrounding countryside.
The person responsible appeared to know the location
of the rubbish tip and local service stations. He also seemed to understand the
bushland well enough to take three travelers into an isolated area.
The vehicle described by witnesses was another
important part of the investigation. A station wagon large enough to transport
three people and their belongings could potentially help explain how the group
had been removed from the campsite.
But establishing a reliable timeline proved
difficult.
The annual Mount Isa Rodeo had recently taken place,
bringing large numbers of visitors into the region. Many subsequently traveled
onward through the Outback.
Investigators had to consider a wide range of people
who might have passed through the area during the relevant period.
The forensic limitations of 1978 made matters harder.
Modern DNA testing,
advanced trace-evidence analysis and today's digital investigative methods were
not available to detectives.
They had witness descriptions, physical evidence, a
missing motorcycle and a growing list of questions. Turning those clues into a
criminal case would prove extremely difficult.
Retired homicide detective Jim O'Donnell, who worked
on the investigation in 1978, continued to reflect on the case decades later.
He repeatedly questioned what the original team might
have done differently and whether an overlooked opportunity could have changed
the outcome.
One lead, however, quickly attracted police
attention.
The stolen motorcycle that brought
investigators to Bruce Preston
On November 13, 1978, less than a month after the
bodies were discovered, police arrested a 23-year-old local man riding Tim
Thompson's missing BMW.
The man initially claimed that he had purchased the
motorcycle second-hand.
He later admitted stealing it, pleaded guilty to the
theft and received a $300 fine.
By the time the BMW was recovered, it had been
cleaned and altered. Its wheels had been changed, and some components had been
removed.
The discovery gave detectives an important connection
to one of the victims' possessions. But motorcycle theft was not proof of
murder, and investigators did not bring additional charges at the time.
The man was Bruce John Preston.
His father, Arthur Preston, was a prominent figure in
Mount Isa's mining community. He worked as a chief trainer at the mines and
conducted underground inductions for many employees.
The family was also familiar with firearms. According
to evidence later presented in court, several guns were kept at the family
home, including a .22-caliber pump-action rifle.
Bruce's older brother, Ian, later told a court that
the family had considerable experience with firearms and that Bruce was
particularly skilled at shooting.
Bruce was also associated with the Black Uhlans, an
outlaw motorcycle gang.
Investigators considered several details significant.
Preston's appearance was said to resemble the description of the dark-haired,
bearded man seen at the caravan park. His family had access to a
brown-and-white Land Cruiser, and the household had a rifle of the same general
caliber as the weapon used in the killings.
The missing BMW had also been found in his
possession.
Taken together, those details made Preston an
important person of interest.
But there was a crucial distinction between suspicion
and proof.
Preston consistently denied involvement in the
murders. The available evidence did not establish his guilt beyond a reasonable
doubt, and he was not charged with the killings in 1978.
The 1980 inquest left the murders
unresolved
In 1980, a coronial inquest in Brisbane examined the
deaths.
The proceedings considered the evidence surrounding
the travelers' disappearance, the discovery of their bodies and the witnesses
who had seen them with another motorbike rider and the driver of a station
wagon.
The inquest returned a finding that the three had
died at the hands of a person or persons unknown.
It did not identify a murderer.
The findings indicated that the killer was believed
to be the person who had picked up the travelers at the caravan park on October
5 and that the murders probably occurred that same day.
The evidence continued to point investigators toward
the circumstances surrounding the brown-and-white vehicle, but the available
material was insufficient to establish criminal responsibility in court.
The investigation eventually became one of
Queensland's long-running unsolved
triple murder cases.
For the families, the consequences lasted far beyond
the inquest.
Karen's father, who had recognized the watch that
helped identify his daughter, died without receiving the answers he had wanted.
Tim and Gordon's parents in New Zealand also grew
older without learning who had killed their sons.
Gordon's older brother, John Twaddle, brought his
brother's ashes home to Mosgiel after the funeral in Brisbane. He reportedly
refused to bury them until someone was held accountable.
The ashes remained above ground for decades.
In 2019, Gordon's brother spoke publicly about the
family's continuing pain. Karen's brother Barry Edwards had also previously
described the frustration of believing that people in Mount Isa might have
known more than they had told investigators.
The passage of time did not make the questions
disappear.
The man at the center of the case
became a senior prison officer
Bruce Preston eventually left Mount Isa and built a
career in the Australian corrections system.
He moved to New South Wales and rose to a senior
position at Goulburn Supermax, a high-security prison housing some of the
country's most dangerous offenders.
For years, he worked inside a facility where strict
security procedures and close supervision were part of everyday life.
Meanwhile, the murder investigation remained
unresolved.
The contrast was striking: the man who had been
questioned in connection with the 1978 case and found with one victim's
motorcycle went on to spend much of his professional life working in a prison.
But the old investigation had never produced a murder
conviction, and Preston continued to deny any involvement.
Then, in 2018, renewed public attention brought fresh
developments.
An anniversary feature published by the Northwest
Star encouraged people with information about the killings to come forward.
Some Mount Isa residents who had known the people involved in 1978, or had
heard information over the years, provided statements to police.
The new material helped prompt a renewed examination
of the original investigation.
A 2019 airport arrest brought the
case back into the headlines
In April 2019, more than four decades after the three
bodies were discovered, Preston arrived at Brisbane Airport.
He was 63 years old and retired.
Queensland detectives from the cold case team
arrested him at the airport and charged him with three counts of murder.
The arrest followed a year-long review led by
Detective Senior Sergeant Tara Kentwell.
Investigators revisited the original police files,
examined the witness accounts and considered information that had emerged after
the 2018 anniversary coverage.
For the families, the arrest represented a major
development.
After decades of uncertainty, a man had finally been
charged in connection with the deaths of Karen Edwards, Tim Thompson and Gordon
Twaddle.
But an arrest is not a conviction. The allegations
still had to withstand the criminal justice process, and Preston maintained his
innocence.
The case was far from over.
The prosecution collapsed before a
murder trial
In 2020, Preston was granted bail.
A Supreme Court judge, Justice Davis, ruled that
investigators had overstated aspects of the evidence when opposing his release.
Bail conditions included a curfew, regular reporting to police and the
surrender of firearms.
Preston remained under those conditions while the
case continued.
Then, in 2023, Queensland prosecutors withdrew all
three murder charges.
The decision meant there would be no criminal trial
in which a jury could examine the allegations and determine whether the
evidence established guilt beyond reasonable doubt.
The withdrawal also left the families without the
answers they had hoped a prosecution might provide.
The central problem was the age of the investigation.
The physical evidence was more than four decades old, some potential witnesses
had died, and forensic testing had not produced evidence that prosecutors could
use to establish the case in court.
Preston was no longer facing the murder charges.
He had spent years under bail conditions, but he had
not been convicted of the killings. He continued to deny responsibility.
For the families, the withdrawal was another
devastating setback.
The murders remained unsolved.
A reopened inquest brought the
evidence back into court in 2025
In October 2025, nearly 47 years after the killings,
Queensland Coroner David O'Connell reopened the inquest.
The nine-day hearing in Brisbane brought the case
back before a courtroom and revisited evidence first examined in 1980.
As many as 40 witnesses were heard during the
proceedings. Counsel assisting the coroner, Amelia Hughes, guided the hearing
through the original findings and the subsequent investigation.
The purpose of a coronial inquest is different from a
criminal trial. It examines the circumstances surrounding deaths and can make
findings about how, when and where people died. It does not determine criminal
guilt in the same way a jury does.
The 2025 proceedings revisited the original
conclusion that the three travelers had been picked up by another man at the
caravan park and were probably killed on October 5.
The original cause-of-death findings were accepted
without amendment.
One of the most significant moments came when Preston
was required to give evidence.
Now 69 and reportedly in poor health, he appeared in
a wheelchair.
The coroner granted him indemnity, meaning his
testimony could not be used against him in a future criminal prosecution. The
protection was intended to allow him to answer questions, but it did not give
him permission to lie.
The coroner warned him about the seriousness of
giving false evidence and indicated that he was very close to the threshold of
perjury.
Preston was questioned about his
timeline and the missing BMW
During his evidence, Preston again denied any
involvement in the murders.
He acknowledged stealing Tim Thompson's BMW in 1978,
but questions about how and when he obtained it became a central part of the
hearing.
Investigators had previously recorded a version of
events in which Preston said he returned to Mount Isa on October 11.
However, witnesses placed him in the area around
October 4 or 5, close to the day the three travelers disappeared.
Counsel questioned him about the difference between
those accounts and whether his earlier timeline had been intended to distance
him from the killings.
Preston rejected that suggestion.
He said his memory of the period was confused and
described his state of mind as being in a whirl. He characterized taking the
motorcycle as a foolish act and said he had not understood the significance of
what had happened to its owners.
When detectives later told him the BMW was connected
to a triple murder investigation, he said the news had hit him like a ton of
bricks.
He also told the hearing that he had spent 11 months
in an isolation cell after his arrest and had thought about the case ever
since.
The coroner was not satisfied that the answers had
resolved all the questions.
Preston was sent home and instructed to return the
following morning with greater certainty about what he was telling the court.
The questioning illustrated the difficulty of
examining events that had taken place almost half a century earlier. Memories
had faded, accounts had changed and the original physical evidence was limited.
His brother faced questions about
their father's alleged words
Preston's older brother, Ian, also appeared before
the inquest.
He was questioned about the family's familiarity with
firearms and Bruce's ability as a marksman. He confirmed that the family had a
history of handling guns.
But another issue proved particularly sensitive.
Witnesses had told the hearing that their father,
Arthur Preston, spent years saying that Bruce was responsible for the murders.
The words attributed to Arthur were that his son had
done it, but that he was tough enough that investigators could not break him.
Ian denied personally hearing his father make those
statements.
However, he acknowledged that the language sounded
like something Arthur might have said, describing him as a hard man.
He could not dismiss the testimony of other witnesses
who had placed the alleged remarks before the court.
The evidence added another complicated layer to the
investigation. It was not a direct confession by Bruce, nor did it establish
that the alleged statements by his father were true.
Instead, it formed part of the broader body of
testimony the coroner had to consider.
The questions that remain after 47
years
The 2025 inquest reopened a case that had troubled
three families for nearly half a century.
But the hearing did not automatically resolve the
murders.
The coroner's findings had not yet been delivered at
the time described in the source account, and Queensland police continued to
investigate the case.
A reward of $250,000 remained available for
information that could help bring the investigation closer to a resolution.
Preston remained the only person ever charged with
the murders of Karen Edwards, Tim Thompson and Gordon Twaddle. Those charges
were withdrawn in 2023, and he continues to maintain his innocence.
The distinction matters. Being charged does not
establish guilt, and the withdrawal of charges means there has been no murder
conviction against him.
The investigation still needs reliable evidence
capable of explaining who killed the three travelers and what happened after
they left the caravan park.
There are also questions about the missing red BMW,
the disposal of the travelers' belongings, the weapon used in the shootings and
the identity of the man who drove the brown-and-white Land Cruiser.
For the families, the passage of time has made
justice increasingly difficult to achieve. People who might once have
remembered important details have died or may no longer be able to recall
events clearly.
Yet even after decades, investigators continue to
seek information that could clarify the final movements of the three friends.
A journey that never reached its
destination
The bushland around Spear Creek remains part of the
remote landscape north of Mount Isa.
In October 1978, three young people traveled through
the Queensland Outback with two motorcycles, a puppy and plans to reach
Melbourne before Christmas.
Karen was looking forward to spending time with Tim.
Gordon was traveling with friends. Tristie rode in the sidecar as the group
made its way across the country.
Their journey ended at a caravan park where they
encountered a man who offered, or appeared to offer, them a ride.
The three friends left their motorcycles and
belongings behind.
That evening, a vehicle reportedly returned without
them. Their possessions were taken away, their puppy was left behind, and the
trail eventually led investigators to three bodies in the bush.
The discovery of Tim's stolen BMW brought Bruce
Preston into the investigation. Decades later, he was charged, but the
prosecution never reached trial and the charges were withdrawn.
The reopened inquest has given the case another
public examination, but it has not erased the uncertainty that has surrounded
it since 1978.
For the families of Karen, Tim and Gordon, the most
important questions remain painfully simple: who took their loved ones away,
why were they killed, and where did the truth disappear?
Nearly half a century later, the Mount Isa triple murder
remains a haunting chapter in Australia's unsolved crime history.
Editorial note: This article describes allegations and evidence reported in connection with an unresolved historical investigation. Bruce Preston was charged with the three murders, but the charges were withdrawn in 2023. He has not been convicted of the killings and maintains his innocence.
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