Just days after making a public appeal for information, detectives investigating Jessie Anne Wilson's alleged murder have made an arrest.
A 39-year-old man from Munno Para West has been arrested and charged with one count of murder.
He has been remanded in custody and will appear before Adelaide Magistrates Court on Monday.
The Mount Gambier woman's badly decomposed body was found on a roadside at Hillier on October 8.
An autopsy has revealed the identity of a woman whose body was found dumped on a roadside in Hillier.
Police are now seeking to discover who murdered Jessie Anne Wilson, a 24-year-old woman from Mount Gambier but who had been living in the Port Adelaide area for the past three months.
She was last seen alive about 10am on September 26 when police were called to a disturbance at a deli on Victoria Road in Taperoo.
Ms Wilson's badly decomposed body was discovered on an isolated stretch of roadside at Hillier on Monday.
It was found by a council worker who was cutting grass on the roadside of Pearsons Road about 1.30pm.
Detective Inspector Mark Trenwith said it was "possible" she was sexually assaulted.
"When her body was found, her clothing was in disarray," he told a press conference in Adelaide on Wednesday.
"Although Ms Wilson was not a reported missing person at the time her body was found, her family had concerns about about her as they had not been in contact with her in the last couple of weeks.
"It's a tragedy."
Ms Wilson was Aboriginal, about 166 centimetres tall, with long, dark hair and a slim build.
Detectives declared her death a major crime after receiving autopsy results on Tuesday.
Anyone with information or who saw Ms Wilson on or after September 26 is asked to call Crime Stoppers on 1800 333 000 or report online at www.sa.crimestoppers.com.au.