The disappearance of a woman east of Kenaston has had a new turn.

Police believe that 51-year-old Sheree Fertuck was murdered by her husband Greg.

A new document released by police refers to an oath from Corporal Jeremy Anderson who states that he has reasonable grounds to believe that Fertuck's husband is responsible.

The two were separated, and in the document, police note a statement from their son Lucas who says that Greg has attempted to cash in joint investments.

Fertuck was last seen leaving her family's farm near Kenaston on December 7. Extensive searches to find her came up empty.

In April, investigators said that the case was being treated as a homicide.