South Australian police have declined to confirm whether a person of interest remains in the case of Gus Lamont, who disappeared from his grandparents' remote sheep station near Yunta nearly one year ago. The four-year-old was last seen on September 27 of the previous year.

In February, police stated their belief that someone known to Gus may have been involved in his disappearance, either accidentally or intentionally. At the time, it was indicated that this individual resided at Oak Park Station and was known to the child, but was not his parents, Jessica Murray or Joshua Lamont.

During a press conference in May, Detective Superintendent Darren Fielke of the Major Crime Investigation Branch stated that one of Gus's grandparents was considered a suspect. In June, Gus's grandmother, Josie Murray, identified herself as that suspect, calling police theories that she may have buried her grandson after an accident "ludicrous."

No charges have been laid, and no arrests have been made in connection with Gus's disappearance. Police have not provided an update on whether Ms. Murray, or any other individual, continues to be a person of interest.

Initially, police outlined three possibilities for Gus's disappearance: that he had wandered off and become lost, that he had been abducted, or that someone known to him was involved. While the theory of harm by a known individual was initially emphasized, police later reiterated that all three lines of inquiry remained open.

"From the time Gus disappeared SA Police have been investigating three specific lines of inquiry – that Gus had wandered off and become lost, that he had been abducted or that a person known to him was involved in his disappearance," a South Australia Police spokesperson stated. "Det Supt Fielke has conducted regular press conferences to update the community on the investigation into Gus’ disappearance - revealing significant operational details because of the intense public interest in the case."

Josie Murray's lawyer, Andrew Ey, affirmed that his client has consistently denied any involvement in Gus's disappearance. "My client has always remained steadfast in her denial," Ey told the Daily Mail.

Gus was last seen by his other grandmother, Shannon Murray, playing outside the homestead on AFL grand final day. According to Josie Murray, she, Shannon Murray, and Gus's mother searched the property on foot and by motorbike until nightfall before contacting the police.

An extensive search involving police, the army, the State Emergency Service, an Aboriginal tracker, and local volunteers commenced and lasted for several weeks, but no trace of the boy was found. Police initially defended the family's request for privacy during this period.

However, in January, the relationship between Josie Murray, Shannon Murray, and investigators reportedly deteriorated. Detective Superintendent Fielke announced in February that a person residing at Oak Park Station, who had withdrawn cooperation, was considered a suspect. Police noted inconsistencies in the information provided by family members regarding timelines and events, clarifying they were not investigating Gus's parents.

In mid-January, police seized a vehicle, a motorcycle, and electronic devices for forensic examination, but by May, they confirmed no evidence was found. Both Josie and Shannon Murray retained legal representation and denied they were not cooperating with the investigation.

In February, Josie Murray was charged with possession of a prohibited gun silencer. She was subsequently fined $10,500 and disqualified from gun ownership for five years. Her defense attorney highlighted that the item was a sound moderator, not an illegal firearm.

In March, it was revealed that a second person had ceased cooperating with investigators. Police allege Shannon Murray has also withdrawn her cooperation from the investigation. IMAGE3

Police have searched Oak Park Station 11 times since Gus vanished. IMAGE4

Josie Murray's lawyer Andrew Ey stated his client remains steadfast in her denial. IMAGE6

In May, Detective Superintendent Darren Fielke indicated that one of Gus's grandparents remained a suspect. IMAGE7

Gus' grandmother Josie Murray described police suspicions as "ludicrous." IMAGE9

Josie faced court in June over the gun silencer charge. IMAGE8

Gus' parents, Jessica Murray and Josh Lamont, are not suspects in the case. IMAGE1

As she left court, an incident occurred involving media personnel. IMAGE2

When Gus disappeared, Josie's relationship with the police appeared amicable. IMAGE10

September 27 will mark one year since Gus Lamont went missing. IMAGE5

Gus' parents released an image of him on his bike. IMAGE11