• Trisha Graf was last seen on December 12
• Her car was found abandoned and inoperable
• READ MORE: Missing teenager in 'imminent danger' 

By ASHLEY NICKEL, NEWS REPORTER, AUSTRALIA and ABE MADDISON FOR AUSTRALIAN ASSOSCIATED PRESS

Published: 13:07 GMT, 29 December 2025 | Updated: 14:14 GMT, 29 December 2025

Police hold grave fears for a woman missing in the outback for 16 days and have renewed search efforts near where her abandoned car was found.

Trisha Graf was last seen in the early hours of Friday, December 12, in the Roxby Downs area about 510km north of Adelaide.

The 41-year-old woman from Andamooka was driving a white 2012 Ford Territory with the SA registration plate S254BCX.

The car was found abandoned and unable to be driven near Blue Dam, east of Andamooka, on December 13.

Police conducted an extensive air and ground search operation, including specialist dive teams, which failed to find any sign of Ms Graf.

On Monday, police were undertaking a further aerial search focusing on an area between Blue Dam and Andamooka, 32km from Roxby Downs, expanding the area already covered during extensive ground searches.

'Due to the length of time since Trisha was last seen, police hold grave concerns for her welfare,' SA Police said in a statement.

A community page stated Ms Graf was wearing black pants and a black top at the time of her disappearance. Her hair was also up in a plait, away from her face.

Trisha Graf was last seen in the early hours of Friday, December 12, in rural South Australia

Her car was found abandoned. SA Police expanded its search for Ms Graf on Monday (pictured, an officer at the search area)

Ms Graf is known to have a nose piercing, lip piercing and ear piercings as well as a skull tattoo on her upper right arm and a mermaid tattoo on her lower forearm.

Anyone with information about Ms Graf's whereabouts or her movements leading up to her disappearance is urged to contact Crime Stoppers.