Officers were at the home on Holden Lane near Cherry Street in Ballina within minutes, where they found the 64-year-old’s body.
Superintendent Scott Tanner said the pair were in a relationship and were classifying the alleged murder as domestic violence.
“The woman suffered significant head traumas,” Tanner said.
“At this stage police are still are still searching the location but they believe there were no weapons involved.”
A 66-year-old man has been charged with murder and contravening an Apprehended Violence Order.
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He has been refused bail and is expected to appear in court tomorrow.
It is unclear whether the man charged is the same man who went to the police station.
The woman is yet to be formally identified.
Police are urging anyone with information, especially witnesses from around the location from 7pm to midnight on January 3, to contact Crime Stoppers on 1800 333 000.