Wollondilly Council rangers have euthanised a dog that mauled its owner to death in Wilton last week.
Rosemary O'Reilly, 72, died after she was attacked by the large Staffordshire terrier-Rhodesian ridgeback cross at her Hornby Street home last Thursday.
Ms O'Reilly suffered significant bite wounds and lacerations to her arms, legs and body. Her husband Derek, 74, also suffered minor injuries.
The couple were rushed to Liverpool Hospital. Ms O'Reilly's condition deteriorated and she died later that day.
Council rangers seized the dog on Friday. A council spokeswoman confirmed the animal was euthanised that day.
The spokeswoman said the council followed the regulatory process for "managing a dangerous dog" under the NSW Companion Animals Act (1998).
She said the council had no record of any previous reports about the dog's behaviour.
"The fatal dog attack that took place at Wilton was extremely upsetting to us and our community," she said.
"Or thoughts are with the family and all of the first responders that had to manage this very distressing incident."