A man has been arrested after a young woman was allegedly stabbed to death in Western Sydney.
The 21-year-old woman was allegedly stabbed twice in the chest about 1.40pm on Monday at a home on the Great Western Hwy at Kingswood.
WATCH THE VIDEO ABOVE: Woman dead in alleged domestic violence stabbing in Sydney’s west.
Know the news with the 7NEWS app: Download today 
Two other people who were present called triple-0.
Paramedics treated the woman but she died at the scene.
She is yet to be formally identified.
A man was seen running from the complex, Superintendent Trent King said.
Officers arrested a 22-year-old man at Derby Street, Penrith, about 7.10pm.
He has been taken to Penrith Police Station and is assisting with inquiries.
Anyone with information is urged to call Crime Stoppers.
