Post-mortem into SA mystery death

A post-mortem has failed to uncover how a South Australian woman died and police are continuing to investigate her mysterious death.

Relatives of the 37-year-old woman flagged down police on the street after finding her body inside a Whyalla Stuart home at about 5pm on Sunday.

Police say the investigation remains ongoing after a post-mortem was conducted in Adelaide on Monday afternoon.

Major Crime squad detectives flew to the area, 400km northwest of Adelaide, on Sunday night to assist with the investigation.