A man has been arrested after a woman was found dead in a home in northern New South Wales.
Police have declared a critical incident after they were called to Johnston Street in Casino, southwest of Byron Bay, about 2.30am today following reports of a welfare concern.
Officers arrived and tried to assist a woman at the home but she died.
The woman, believed to be aged in her 40s, has not yet been formally identified.
A man, 31, was arrested at the scene and taken to Lismore Police Station, where he is being questioned.
Police said they believe the man is known to the woman.
A crime scene has been established at the home and a critical incident investigation is underway into the death and the response from NSW Police.
State homicide officers are helping local police in their investigations.
Anyone with information in relation to the incident is urged to contact local police or Crime Stoppers on 1800 333 000.
