Police have released an image of Stephen Boyd, who is wanted for questioning in relation to the bashing death of his partner Tina Kontozis in Bundeena on Sunday afternoon.
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In a renewed call for public information, police said Mr Boyd was believed to be driving a silver 2002 model Holden Commodore sedan; bearing NSW registration plates BZ 53 ZO.
Anyone with information on the whereabouts of Mr Boyd, 51, is urged to come forward.
Should members of the community see Mr Boyd, they're urged not to approach him, but to contact Triple Zero (000) immediately, police said.
Police were called to the home in Beachcomber Avenue, Bundeena, about 3.30pm after neighbours heard people fighting and someone screaming.
It is believed a man armed with a cricket bat bashed Ms Kontozis, 51, woman to death and injured a 17-year-old boy. The boy was taken to Sutherland Hospital for treatment.
A crime scene was established at the home, which was examined by detectives and forensic specialists.
Ms Kontozis worked at the local day care centre Goanna Patch Kindergarten. She wrote a book about Bundeena called Shelly and the Rescue Warriors.
The picturesque village of Bundeena is surrounded by the Royal National Park and is home to about 2000 people.
While there is only one road in and out of the village, police are concerned the alleged offender could escape on foot via the National Park or Bonnie Vale, the largest camp ground in the Park.
Police have set up a search team at nearby Maianbar.
Family and friends expressed their sadness and disbelief on Facebook.
Fiona Schneider wrote: "A beautiful women taken from the world to (sic) early. You deserved so much better. We will never forget u XX".
Debra Smith wrote: "We are so sorry to hear this. This lady was salt of the earth."