The woman who suffered from serious burns at Rouse Hill on Monday has died in the hospital.
Police said the 32-year-old died yesterday morning.
Police from The Hills Local Area Command established a crime scene and inquiries surrounding the incident are continuing.
A spokesman said police and paramedics were called by a neighbour who saw the woman who was on fire, running from the house on Greensborough Avenue at about 2pm.
She was airlifted to Royal North Shore Hospital in a serious condition.
The woman’s husband, aged 34, was taken to hospital with minor burns and has since been released.
There was nobody else at home at the time.
Police are urging anyone with information about this incident to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page: https://www1.police.nsw.gov.au/.