Gus Lamont has been missing from his home at Oak Park Station since September 27, 2025. (Supplied/ABC News: Stephan Hammat)

When news broke of the disappearance of a four-year-old boy in outback South Australia on September 27, 2025, countless theories and conspiracies emerged.

SA Police were quick to state that the main assumption was that Gus Lamont, who had been “playing outside in the sand like he normally does”, had simply “wandered off” into the bush.

But this theory took a dark turn this week, when SA Police revealed the case was now considered a major crime.

Police remained hopeful at the start

In initial communication on the matter, police involved in the search said they remained “hopeful” Gus would be found alive, despite the harsh conditions of the terrain at Oak Park Station.

The conversations around the “adventurous” country lad at times evoked hope that it was all a case of misadventure that would soon be resolved.

Emergency services had been contacted a few hours after Gus was reported missing on the Saturday evening, and police put up a helicopter to survey the area.

By Sunday, SES and police had begun a ground search for Gus, surveying a 2.5-kilometre radius search area “from where Gus was last seen”.

The search continued in the following days. On Tuesday, a boot print was found a few hundred metres away from the homestead. By Thursday, authorities released the first image of Gus to the public.

But hopes for a miracle were quickly fading as the days passed.

“A 4-year-old lad, they just don’t disappear into thin air. They have to be somewhere,” said Yorke and Mid North region Superintendent Mark Syrus.

Questions soon shifted to other lines of inquiry, including whether Gus had been abducted from the property or had met with foul play.

Despite detectives forming part of the police presence on site and speaking with people known to Gus, the prevailing assumption that Gus had walked off continued.

“This is clearly now what appears to be a very tragic set of circumstances, and we hold out hope that we may be able to find Gus and return him to his family.”

Despite police commentary, it did little to quell the ongoing, growing discussion online among amateur sleuths and the general public.

AI-generated images of Gus were shared online, along with theories about the disappearance and Gus’s family.

Senior Constable Peter Williams told ABC Radio Adelaide that police phone lines had been “inundated” with information.

“I do remind people that the purpose of the image going out is for anyone who’s got actual information that may assist the investigation,” Senior Constable Williams said.

“We just ask people, we’re not after your opinions. We’re after help with the investigation.

“If it is just an opinion, perhaps keep it to yourself, but if you’ve got factual information, feel free to give us a call and provide that.”

Taskforce of specialists

By mid-October, SA Police Commissioner Grant Stevens announced Taskforce Horizon, which he said comprised 12 people, including “a range of specialists who will continue to analyse information, assess opportunities for further searches on the property, and investigate all of the circumstances that possibly might have occurred that resulted in Gus going missing”.

He said the renewed search that was launched at the family’s remote sheep station, about 350km north of Adelaide, that same week was “not based on new information” and there was “nothing to suggest foul play”.

“There is no evidence to suggest any other circumstances that might have resulted in Gus not being located, but we also have an obligation to consider all possibilities, and that’s part of our work going forward — to make sure nothing is left unaddressed,” the commissioner said at the time.

In the weeks that followed the initial disappearance, police and crews returned to the station on multiple occasions, emptying dams and checking mine shafts, with no findings.

While the public was given updates on each search, the distance and challenging conditions made it difficult for those conducting them.

But the biggest development was happening behind the scenes.

On Thursday, February 5, Major Crime officer in charge Detective Superintendent Darren Fielke held a press conference where he revealed Gus Lamont’s disappearance was now considered a major crime investigation.

In a briefing, the most detailed from police since the initial disappearance, Superintendent Fielke explained the process and reasons behind the initial declared search areas and the factors in its investigation.

He said they had been exploring three “investigation options” in relation to the disappearance — that the boy walked off from Oak Park Station, that he was abducted or that someone known to him was involved in his disappearance and suspected death.

He said they had “found no evidence, physical or otherwise, to suggest that Gus has merely wandered off from the Oak Park homestead” and “no evidence to suggest that Gus was abducted from the property”.

He said “inconsistencies” in the information provided to police had left them with a suspect.

“I do want to stress, however, that Gus’s parents are not suspects in his disappearance.”

No arrests have been made, but several items, including a car and electronic devices, have been seized.

At the conclusion of the press conference, he asked the media to respect the privacy of Gus’s parents, who he reiterated were not suspects in the disappearance.

“We are all focused and determined to locate Gus and return him to his parents,” he said.

“Nothing is off the table as we work towards that outcome.”

As the world watches on, a conclusion to the case could be sooner rather than later.