Police have declared the disappearance of 41‑year‑old Trisha Graf from Andamooka a major crime.
Following just over three weeks of intensive investigations and extensive ground and air searches, detectives believe Trisha's disappearance is suspicious.
Trisha was at the Roxby Downs hotel at 12.19am on Friday 12 December. She left a short time later and was driving a white 2012 Ford Territory, SA registration S254BCX, accompanied by a friend.
After leaving the hotel Trisha travelled from Roxby Downs towards Andamooka before colliding with a kangaroo a short distance from the Andamooka Township.
After striking the kangaroo Trisha and her friend continued onto Andamooka where they visited a home in the north-western area of the town. After a short time Trisha left just before 2am to travel the short distance home. Trisha was last seen driving along Dunstan Drive, Andamooka.
Just after midday on Friday 12 December 2025, Trisha's partner and a friend were searching for her when they located Trisha's Ford Territory, which was perched on a dirt mound near the Blue Dam east of Andamooka.
The vehicle had accident damage caused by the collision with the kangaroo, but was unable to be driven because of its location on the dirt mound.
An initial ground and aerial search of the area was conducted by police and SES followed by a further search by members of the Andamooka community. A search of the Blue Dam was subsequently conducted by police divers. These searches have failed to locate Trisha.
Since that time police from the Far North, Port Augusta, the Missing Persons Section and Polair have conducted additional ground and aerial searches.
Major Crime Investigation Branch officer-in-charge Detective Superintendent Darren Fielke said police hold grave concerns for Trisha's welfare.
"Since Trisha was last seen there have been significant investigations and several detailed, thorough searches conducted in an effort to locate her,'' he said.
"Her thongs were found with her vehicle and we would have expected to locate her if she had simply wandered off a short distance.
"Taking this step in the investigation will allow more specialist resources to be committed to both determine what has happened to Trisha and locate her.''
Police have conducted aerial searches using Polair in a 4.7km radius of the abandoned vehicle and extensive ground searches have also been conducted within that zone.
Early last week police conducted a further extensive aerial search using a drone and the imagery obtained has been analysed, but no trace of Trisha was located.
Detectives have spoken to a number of people known to Trisha, along with locals from Andamooka and Roxby Downs in recent weeks as part of the investigation.
"We are still seeking information from people who were with Trisha at the Roxby Downs Hotel shortly before her disappearance and those who saw her after she returned to Andamooka,'' Det. Superintendent Fielke said.
Anyone with information about Trisha's whereabouts or her movements leading up to her disappearance is urged to contact Crime Stoppers on 1800 333 000 or online at www.crimestopperssa.com.au - you can remain anonymous.
