Detective Sergeant Hayden Smale said emergency services were called to Adams Flat Rd, in Crichton, about 6.10pm yesterday.
He confirmed this morning that a woman had died in Crichton and a man remained in a critical condition in hospital following the incident.
Stuff is reporting that a family member confirmed the woman as Milton vet Jillian Clark and the critically injured person as her partner.
The property is cordoned off this morning and a guard in place while police conduct a scene examination.
Inquiries into the circumstances of the incident were continuing.
"There is not believed to be any risk to public safety following this incident," Det Sgt Smale said in a statement late this morning.
"The Crichton community can expect to see an increased police presence in the area while these inquiries are carried out."
A police tent has been set up near buildings at the property.
A St John spokesman earlier confirmed that one person had been airlifted to hospital in a critical condition.
- Allied Media
