The man arrested today is believed to be Adam Jervis Weily, who lived at the house where Steven James Hunter is alleged to have dumped Ms Cafferkey’s body.
TWO men questioned in relation to the death of Bacchus Marsh woman Sarah Cafferkey have been released from police custody.
Homicide squad police arrested the men at a property at Tarneit in Melbourne's west about noon on Thursday.
After interviews all afternoon, a police statement at 9.15pm said a 32-year-old from Tarneit and a 34-year-old from Point Cook had been released "pending further enquiries".
Police said the investigation into Ms Cafferkey’s disappearance was continuing.